diff --git a/.agents/notes/proposed/architecture/2026-07-27-session-projection-and-command-log.i18n.yaml b/.agents/notes/proposed/architecture/2026-07-27-session-projection-and-command-log.i18n.yaml
index 22e7a7b764..a45fca0db5 100644
--- a/.agents/notes/proposed/architecture/2026-07-27-session-projection-and-command-log.i18n.yaml
+++ b/.agents/notes/proposed/architecture/2026-07-27-session-projection-and-command-log.i18n.yaml
@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write .agents/notes/proposed/architecture/2026-07-27-session-projection-and-command-log.md
-2026-07-27-session-projection-and-command-log.md: a8495f958b209d1f515f111834cbcf0551393bc0
-2026-07-27-session-projection-and-command-log.zh.md: 89dd865b0562e94ef602970bf57a71b7ce53928d
+2026-07-27-session-projection-and-command-log.md: 060ea402cf621cc3303fddae897b04df7187bb90
+2026-07-27-session-projection-and-command-log.zh.md: 9077331ec8315b09c4feebb4073bea9dead752c3
diff --git a/.agents/notes/proposed/architecture/2026-07-27-session-projection-and-command-log.md b/.agents/notes/proposed/architecture/2026-07-27-session-projection-and-command-log.md
index a8495f958b..060ea402cf 100644
--- a/.agents/notes/proposed/architecture/2026-07-27-session-projection-and-command-log.md
+++ b/.agents/notes/proposed/architecture/2026-07-27-session-projection-and-command-log.md
@@ -28,7 +28,7 @@ A light interface package: the merge-extensible type map, the registry service,
 
 What a domain registers is a **state-driven computation unit** — three pure functions plus declarations — never an opaque getter. The framework owns driving it (subscription, watermark, caching, and later checkpointing); the domain owns only the mathematics. Projections serve every business domain (session title, plan, goal, permission, todos); commands are merely one trigger path and hold no special position in this contract.
 
-```ts
+```ts ignore-check
 export interface SessionProjectionMap {}   // the single type table for the whole chain
 
 export interface ProjectionDefinition<K extends keyof SessionProjectionMap, S> {
@@ -58,7 +58,7 @@ declare module 'cordis' {
 
 ### Wire: projections block on the history tail page
 
-```ts
+```ts ignore-check
 // session.history response, tail page only (beforeSeq absent):
 { events, hasMore,
   projections?: { asOfSeq: number, values: Partial<SessionProjectionMap> } }
@@ -74,7 +74,7 @@ Retired by this block: `session.planMode` and `setPlanMode` (both sides — plan
 
 Because the host is the only computation site, finished values reach clients over one new mux frame:
 
-```ts
+```ts ignore-check
 // MuxFrame union + schema branch:
 { type: 'session/projection', sessionId, key: string, value: unknown, seq: number }
 ```
@@ -97,7 +97,7 @@ A domain's input event set is its own choice — that is the general rule this e
 
 The existing four seats cannot host this state (store discipline bans business objects; inject bans hooks; `ConversationSnapshot` is being evacuated). `useProjection` becomes a framework seat, minted in web-react (the one hook constructor), delivered through the same standard-kit channel as `useSession` (`provideInfo` → SessionProvider → props):
 
-```ts
+```ts ignore-check
 type UseProjection = {
   <K extends keyof SessionProjectionMap>(key: K): SessionProjectionMap[K] | undefined
   <K extends keyof SessionProjectionMap, S>(
@@ -114,7 +114,7 @@ The one existing violation of "no hooks through inject" — `DetailsInjected.use
 
 Two log-only (non-surface, model-invisible) events, mirroring the `tool/call`/`tool/result` pairing:
 
-```ts
+```ts ignore-check
 'command/run':  { commandId: string; name: string; args: string; source: CommandSource }
 'command/done': { commandId: string; kind: 'success' | 'error'; text?: string }
 ```
diff --git a/.agents/notes/proposed/architecture/2026-07-27-session-projection-and-command-log.zh.md b/.agents/notes/proposed/architecture/2026-07-27-session-projection-and-command-log.zh.md
index 89dd865b05..9077331ec8 100644
--- a/.agents/notes/proposed/architecture/2026-07-27-session-projection-and-command-log.zh.md
+++ b/.agents/notes/proposed/architecture/2026-07-27-session-projection-and-command-log.zh.md
@@ -28,7 +28,7 @@ Status: proposed
 
 领域注册的是一个**状态驱动计算单元（state-driven computation unit）**——三个纯函数外加若干声明——绝不是一个不透明的 getter。驱动它是框架的职责（订阅、水位线（watermark）、缓存，以及后续的检查点机制），领域只负责数学本身。投影服务于所有业务领域（会话标题、plan、goal、权限、todos）；命令只是其中一条触发路径，在本契约中没有任何特殊地位。
 
-```ts
+```ts ignore-check
 export interface SessionProjectionMap {}   // the single type table for the whole chain
 
 export interface ProjectionDefinition<K extends keyof SessionProjectionMap, S> {
@@ -58,7 +58,7 @@ declare module 'cordis' {
 
 ### 协议层：历史尾页上的 projections 块
 
-```ts
+```ts ignore-check
 // session.history response, tail page only (beforeSeq absent):
 { events, hasMore,
   projections?: { asOfSeq: number, values: Partial<SessionProjectionMap> } }
@@ -74,7 +74,7 @@ api-proxy 的历史处理器切出尾页后读取 `session.seq`，然后同步
 
 既然 host 是唯一计算地点，成品值经一个新的 mux 帧送达客户端：
 
-```ts
+```ts ignore-check
 // MuxFrame union + schema branch:
 { type: 'session/projection', sessionId, key: string, value: unknown, seq: number }
 ```
@@ -97,7 +97,7 @@ plan mode 完整演示了这套模式——触发路径、运行面、回放面
 
 既有四个席位都装不下这份状态（store 纪律禁止业务对象；inject 禁止钩子；`ConversationSnapshot` 正在被清退）。`useProjection` 成为一个框架席位，在 web-react（唯一的钩子铸造点）铸造，经与 `useSession` 相同的标准套件通道（`provideInfo` → SessionProvider → props）送达：
 
-```ts
+```ts ignore-check
 type UseProjection = {
   <K extends keyof SessionProjectionMap>(key: K): SessionProjectionMap[K] | undefined
   <K extends keyof SessionProjectionMap, S>(
@@ -114,7 +114,7 @@ type UseProjection = {
 
 两个仅日志（非 surface、模型不可见）事件，镜像 `tool/call`/`tool/result` 的配对：
 
-```ts
+```ts ignore-check
 'command/run':  { commandId: string; name: string; args: string; source: CommandSource }
 'command/done': { commandId: string; kind: 'success' | 'error'; text?: string }
 ```
diff --git a/docs/capability-seams.md b/docs/capability-seams.md
index 9093f41f15..87efb87c87 100644
--- a/docs/capability-seams.md
+++ b/docs/capability-seams.md
@@ -74,6 +74,9 @@ flowchart LR
   svc_planMode["ctx.planMode<br/>Plan collaboration state"]
   pkg_commands["commands"]
   svc_commands["ctx.commands<br/>Human command registry"]
+  pkg_session_projection["session-projection"]
+  svc_sessionProjections["ctx.sessionProjections<br/>Session projection units"]
+  pkg_host_apiproxy["host-apiproxy"]
   svc_tui["ctx.tui<br/>Mounted-terminal interaction service"]
   pkg_skill["skill"]
   svc_skills["ctx.skills<br/>Skill provider registry"]
@@ -180,6 +183,7 @@ flowchart LR
   pkg_session_persistence --> svc_sessionPersistence
   pkg_session_persistence_jsonl --> svc_sessionPersistence
   pkg_session_persistence_sqlite --> svc_sessionPersistence
+  pkg_session_projection --> svc_sessionProjections
   pkg_session_query --> svc_sessionQuery
   pkg_session_query_sqlite --> svc_sessionQuery
   pkg_session_reference --> svc_sessionReferences
@@ -257,6 +261,9 @@ flowchart LR
   svc_sessionPersistence --> pkg_session_query
   svc_sessionPersistence --> pkg_session_query_sqlite
   svc_sessionPersistence --> pkg_tool_bash
+  svc_sessionProjections --> pkg_host_apiproxy
+  svc_sessionProjections --> pkg_session_title
+  svc_sessionProjections --> pkg_tool_todo
   svc_sessionQuery --> pkg_session_reference
   svc_sessionQuery --> pkg_tool_session_query
   svc_sessionReferences --> pkg_tui
@@ -328,6 +335,7 @@ flowchart LR
 | `ctx.userInteraction` | `seam` | [`user-interaction`](../packages/ui/user-interaction) | [`tui`](../packages/ui/tui) | [`tool-ask-user`](../packages/ui/tool-ask-user), [`tui`](../packages/ui/tui) | - | UI front doors provide the active human-answer provider; tool-ask-user pauses a tool call on the provider-neutral ask() promise. |
 | `ctx.planMode` | `core` | [`plan-mode`](../packages/plan/plan-mode) | - | - | - | Folds logged plan/mode state, flushes user selections at turn boundaries, renders deployment-owned guidance, registers /plan, and keeps the plan-exit schema stable across transitions. |
 | `ctx.commands` | `core` | [`commands`](../packages/ui/commands) | - | [`tui`](../packages/ui/tui) | - | Plugins register direct human commands; TUI consumes the effective per-agent catalog without sending invocations to the model. |
+| `ctx.sessionProjections` | `core` | [`session-projection`](../packages/session-projection/session-projection) | - | [`tool-todo`](../packages/todo/tool-todo), [`session-title`](../packages/session-title/session-title), [`host-apiproxy`](../packages/host/apiproxy) | - | Domains register state-driven fold units; the eager drive keeps per-session watermark states and api-proxy serves baselines and pushes changed values. |
 | `ctx.tui` | `bundle` | [`tui`](../packages/ui/tui) | - | - | - | One TUI front door provides a FIFO overlay host; injected plugins receive caller-fiber ownership without access to pi-tui or terminal lifecycle state. |
 | `ctx.skills` | `seam` | [`skill`](../packages/skill/skill) | [`skill-local`](../packages/skill/skill-local) | [`tool-skill`](../packages/skill/tool-skill) | - | Merges provider skill catalogs; tool-skill renders the session-prefix catalog and loads complete skill bodies. |
 | `ctx.agents` | `core` | [`agent`](../packages/core/agent) | - | [`agent-loop`](../packages/core/agent-loop), [`acp`](../packages/acp/acp), [`cli-demo`](../packages/examples/cli-demo), [`subagent-inprocess`](../packages/subagent/subagent-inprocess), [`tui-demo`](../packages/examples/tui-demo) | - | Owns live Agent handles, the create/resume factory seam, and process-local initiator propagation. |
diff --git a/docs/config-catalog.md b/docs/config-catalog.md
index 815e21ee5c..466362eead 100644
--- a/docs/config-catalog.md
+++ b/docs/config-catalog.md
@@ -1148,7 +1148,7 @@ export interface Config {
 }
 ```
 
-Source: [`packages/session-title/session-title/src/index.ts:69`](../packages/session-title/session-title/src/index.ts)
+Source: [`packages/session-title/session-title/src/index.ts:77`](../packages/session-title/session-title/src/index.ts)
 
 ## `@deepseek-ai/dsh-session-title-all-messages-llm`
 
@@ -2101,7 +2101,7 @@ These load from a `cordis.yml` entry with no `config:` block; they declare no co
 - `@deepseek-ai/dsh-client-ui-trajectory` ([`packages/client/ui-trajectory/src/index.ts`](../packages/client/ui-trajectory/src/index.ts))
 - `@deepseek-ai/dsh-client-ui-workspace` ([`packages/client/ui-workspace/src/index.ts`](../packages/client/ui-workspace/src/index.ts))
 - `@deepseek-ai/dsh-command-goal` — requires `commands` · `goals` ([`packages/goal/command-goal/src/index.ts`](../packages/goal/command-goal/src/index.ts))
-- `@deepseek-ai/dsh-commands` ([`packages/ui/commands/src/index.ts`](../packages/ui/commands/src/index.ts))
+- `@deepseek-ai/dsh-commands` — requires `sessions` ([`packages/ui/commands/src/index.ts`](../packages/ui/commands/src/index.ts))
 - `@deepseek-ai/dsh-fs-policy` ([`packages/fs/fs-policy/src/index.ts`](../packages/fs/fs-policy/src/index.ts))
 - `@deepseek-ai/dsh-goal-session` — requires `agents` · `goals` · `sessions` ([`packages/goal/goal-session/src/index.ts`](../packages/goal/goal-session/src/index.ts))
 - `@deepseek-ai/dsh-llm` ([`packages/llm/llm/src/index.ts`](../packages/llm/llm/src/index.ts))
@@ -2109,6 +2109,7 @@ These load from a `cordis.yml` entry with no `config:` block; they declare no co
 - `@deepseek-ai/dsh-pty` ([`packages/pty/pty/src/index.ts`](../packages/pty/pty/src/index.ts))
 - `@deepseek-ai/dsh-session` ([`packages/core/session/src/index.ts`](../packages/core/session/src/index.ts))
 - `@deepseek-ai/dsh-session-checkpoint-policy` — requires `llm` · `sessionPersistence` · `sessions` · `tools` ([`packages/session-persistence/session-checkpoint-policy/src/index.ts`](../packages/session-persistence/session-checkpoint-policy/src/index.ts))
+- `@deepseek-ai/dsh-session-projection` ([`packages/session-projection/session-projection/src/index.ts`](../packages/session-projection/session-projection/src/index.ts))
 - `@deepseek-ai/dsh-storage` ([`packages/storage/storage/src/index.ts`](../packages/storage/storage/src/index.ts))
 - `@deepseek-ai/dsh-subagent` ([`packages/subagent/subagent/src/index.ts`](../packages/subagent/subagent/src/index.ts))
 - `@deepseek-ai/dsh-subprocess-local` ([`packages/subprocess/subprocess-local/src/index.ts`](../packages/subprocess/subprocess-local/src/index.ts))
diff --git a/docs/cordis-catalog/events.md b/docs/cordis-catalog/events.md
index 3853120d65..06895b8679 100644
--- a/docs/cordis-catalog/events.md
+++ b/docs/cordis-catalog/events.md
@@ -415,7 +415,7 @@ A command was registered or unregistered. This is an unfiltered registry notific
 'commands/change'(): void
 ```
 
-Source: [`packages/ui/commands/src/index.ts:103`](../../packages/ui/commands/src/index.ts)
+Source: [`packages/ui/commands/src/index.ts:161`](../../packages/ui/commands/src/index.ts)
 
 ## `domain/*`
 
diff --git a/docs/cordis-catalog/services.md b/docs/cordis-catalog/services.md
index 4636eab20e..6e4ceb4ab4 100644
--- a/docs/cordis-catalog/services.md
+++ b/docs/cordis-catalog/services.md
@@ -413,17 +413,27 @@ find(agent: Agent, name: string): CommandDefinition | undefined
 
 /**
  * Parse and execute a known command without sending it to the model.
+ *
+ * A resolved command's lifecycle is durably logged: `command/run` is
+ * appended before the handler is invoked and `command/done` after
+ * settlement (a thrown or aborted handler settles as `kind: 'error'`).
+ * Admission misses (syntax or unknown name) log nothing — they never
+ * entered a handler. A `command/run` append failure fails the execution
+ * loud; a `command/done` append failure on the handler-failure path is
+ * contained so the handler's own error stays the reported failure.
+ *
  * @param agent - exact receiving agent.
  * @param line - complete slash-command line.
  * @param signal - cancellation signal owned by the UI request.
- * @returns a detached result, or `undefined` when syntax or name does not resolve.
+ * @returns the settled execution (result + lifecycle pairing id), or
+ *   `undefined` when syntax or name does not resolve.
  */
-async execute( agent: Agent, line: string, signal: AbortSignal, ): Promise<CommandResult | undefined>
+async execute( agent: Agent, line: string, signal: AbortSignal, ): Promise<CommandExecution | undefined>
 ```
 
-Types: [Agent](../core-data-structures/core.md) · [CommandDefinition](../core-data-structures/commands.md) · [CommandDescriptor](../core-data-structures/commands.md) · [CommandResult](../core-data-structures/commands.md)
+Types: [Agent](../core-data-structures/core.md) · [CommandDefinition](../core-data-structures/commands.md) · [CommandDescriptor](../core-data-structures/commands.md)
 
-Source: [`packages/ui/commands/src/index.ts:227`](../../packages/ui/commands/src/index.ts)
+Source: [`packages/ui/commands/src/index.ts:285`](../../packages/ui/commands/src/index.ts)
 
 ## `ctx.compact` — `CompactService` (abstract seam)
 
@@ -1062,6 +1072,44 @@ Types: [SessionEvent](../core-data-structures/core.md) · [SessionHeader](../cor
 
 Source: [`packages/session-persistence/session-persistence/src/index.ts:52`](../../packages/session-persistence/session-persistence/src/index.ts)
 
+## `ctx.sessionProjections` — `SessionProjectionRegistry`
+
+`ctx.sessionProjections`: the projection unit table and its drive. The service subscribes to `session/event` once; every committed event passes every registered unit's `apply` (eager drive), and a changed state reference notifies the change feed with the schema-validated view. Cells build lazily — a unit registered after events flowed, or a session older than the registry, folds `init` over the in-memory log on first touch (event or read). Registration is an effect (disposer rides the calling fiber): an unloaded domain plugin's key disappears from snapshots and clients read it as capability absence. Duplicate keys throw. Domain plugins register under `ctx.inject(['sessionProjections'], …)` so headless assemblies without the registry stay unaffected.
+
+```ts cordis-catalog
+/**
+ * Register one domain's unit. The registration is an effect on the calling
+ * context's fiber: disposing the fiber (or calling the returned disposer)
+ * removes the key — and the unit's cached cells — from subsequent drives
+ * and snapshots.
+ * @param definition - key, boundary schema, pure unit functions, and stateVersion.
+ * @returns the exact disposer that unregisters this unit.
+ */
+register<K extends keyof SessionProjectionMap, S>(definition: ProjectionDefinition<K, S>): () => void
+
+/**
+ * Subscribe to the change feed. The registration is an effect on the
+ * calling context's fiber.
+ * @param listener - called once per unit whose state reference changed, per committed event.
+ * @returns the exact disposer that unsubscribes.
+ */
+onChanged(listener: ProjectionChangeListener): () => void
+
+/**
+ * One consistent cut over every registered unit for one session, read from
+ * the watermark cache (missing cells fold lazily over the in-memory log).
+ * Fully synchronous — every value and `asOfSeq` reflect the same log
+ * position. Each value passes its unit's schema before leaving.
+ * @param session - the session whose projection values are read.
+ * @returns the snapshot; `values` is empty when no unit is registered.
+ */
+snapshot(session: Session): ProjectionSnapshot
+```
+
+Types: [Session](../core-data-structures/session.md)
+
+Source: [`packages/session-projection/session-projection/src/index.ts:136`](../../packages/session-projection/session-projection/src/index.ts)
+
 ## `ctx.sessionQuery` — `SessionQueryService` (abstract seam)
 
 Unified live-preferred session query service.
@@ -1400,7 +1448,7 @@ register(provider: SessionTitleProvider): () => Promise<void>
 
 Types: [Session](../core-data-structures/session.md) · [SessionTitleProvider](../core-data-structures/session-title.md) · [SessionTitleSnapshot](../core-data-structures/session-title.md)
 
-Source: [`packages/session-title/session-title/src/index.ts:283`](../../packages/session-title/session-title/src/index.ts)
+Source: [`packages/session-title/session-title/src/index.ts:291`](../../packages/session-title/session-title/src/index.ts)
 
 ## `ctx.skills` — `SkillService`
 
diff --git a/docs/event-producer-consumer.md b/docs/event-producer-consumer.md
index 5ff92cfcf2..b6c6c5a39c 100644
--- a/docs/event-producer-consumer.md
+++ b/docs/event-producer-consumer.md
@@ -24,7 +24,7 @@ This matrix shows which packages dispatch each harness-owned event and which pac
 | `agent/step` | `serial` | [`packages/core/agent/src/types.ts:349`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`serial`) | [`compact-basic`](../packages/compact/compact-basic), [`plan-mode`](../packages/plan/plan-mode), [`session-checkpoint-policy`](../packages/session-persistence/session-checkpoint-policy), [`time-context`](../packages/context/time-context), [`tool-skill`](../packages/skill/tool-skill), [`user-approval`](../packages/ui/user-approval), [`workspace-context`](../packages/context/workspace-context) |
 | `agent/turn-stopping` | `serial` | [`packages/core/agent/src/types.ts:392`](../packages/core/agent/src/types.ts) | [`agent-loop`](../packages/core/agent-loop) (`serial`) | [`hooks-claude`](../packages/hooks/hooks-claude), [`hooks-codex`](../packages/hooks/hooks-codex) |
 | `approval/request` | `waterfall` | [`packages/ui/user-approval/src/index.ts:30`](../packages/ui/user-approval/src/index.ts) | [`user-approval`](../packages/ui/user-approval) (`waterfall`) | [`acp`](../packages/acp/acp) |
-| `commands/change` | `emit` | [`packages/ui/commands/src/index.ts:103`](../packages/ui/commands/src/index.ts) | [`commands`](../packages/ui/commands) (`events.dispatch`) | `apiproxy`, [`tui`](../packages/ui/tui) |
+| `commands/change` | `emit` | [`packages/ui/commands/src/index.ts:161`](../packages/ui/commands/src/index.ts) | [`commands`](../packages/ui/commands) (`events.dispatch`) | `apiproxy`, [`tui`](../packages/ui/tui) |
 | `domain/changed` | `emit` | [`packages/storage/storage-domain/src/events.ts:46`](../packages/storage/storage-domain/src/events.ts) | [`storage-domain`](../packages/storage/storage-domain) (`emit`) | `apiproxy`, [`storage-domain`](../packages/storage/storage-domain), [`workspace`](../packages/workspace/workspace) |
 | `fs/edit-intent` | `waterfall` | [`packages/fs/fs/src/index.ts:62`](../packages/fs/fs/src/index.ts) | [`tool-fs`](../packages/fs/tool-fs) (`waterfall`) | [`fs-policy`](../packages/fs/fs-policy) |
 | `fs/observed` | `emit` | [`packages/fs/fs/src/index.ts:71`](../packages/fs/fs/src/index.ts) | [`tool-fs`](../packages/fs/tool-fs) (`emit`) | [`fs-policy`](../packages/fs/fs-policy) |
@@ -33,7 +33,7 @@ This matrix shows which packages dispatch each harness-owned event and which pac
 | `llm/stream` | `waterfall` | [`packages/llm/llm/src/index.ts:53`](../packages/llm/llm/src/index.ts) | [`llm`](../packages/llm/llm) (`waterfall`) | [`agent-loop`](../packages/core/agent-loop), [`llm`](../packages/llm/llm), [`llm-replay`](../packages/support/llm-replay), [`session-checkpoint-policy`](../packages/session-persistence/session-checkpoint-policy), [`session-title`](../packages/session-title/session-title) |
 | `session/created` | `emit` | [`packages/core/session/src/index.ts:70`](../packages/core/session/src/index.ts) | [`session`](../packages/core/session) (`events.dispatch`) | `apiproxy`, [`compact`](../packages/compact/compact), [`goal`](../packages/goal/goal), [`hook-protocol`](../packages/hooks/hook-protocol), [`jsonrpc`](../packages/ui/jsonrpc), [`llm-retry`](../packages/llm/llm-retry), [`session`](../packages/core/session), [`session-persistence`](../packages/session-persistence/session-persistence), [`session-telemetry`](../packages/telemetry/session-telemetry), [`user-approval`](../packages/ui/user-approval) |
 | `session/disposed` | `emit` | [`packages/core/session/src/index.ts:80`](../packages/core/session/src/index.ts) | [`session`](../packages/core/session) (`events.dispatch`) | [`agent-loop`](../packages/core/agent-loop), `apiproxy`, [`session-persistence`](../packages/session-persistence/session-persistence), [`session-telemetry`](../packages/telemetry/session-telemetry), [`session-title`](../packages/session-title/session-title) |
-| `session/event` | `emit` | [`packages/core/session/src/index.ts:92`](../packages/core/session/src/index.ts) | [`session`](../packages/core/session) (`events.dispatch`) | [`acp`](../packages/acp/acp), `apiproxy`, [`cli-demo`](../packages/examples/cli-demo), [`compact`](../packages/compact/compact), [`compact-basic`](../packages/compact/compact-basic), [`goal`](../packages/goal/goal), [`goal-session`](../packages/goal/goal-session), [`hook-protocol`](../packages/hooks/hook-protocol), [`jsonrpc`](../packages/ui/jsonrpc), [`llm-retry`](../packages/llm/llm-retry), [`session`](../packages/core/session), [`session-persistence`](../packages/session-persistence/session-persistence), [`session-telemetry`](../packages/telemetry/session-telemetry), [`session-title`](../packages/session-title/session-title), [`token-meter`](../packages/llm/token-meter), [`tui`](../packages/ui/tui), [`user-approval`](../packages/ui/user-approval), [`workspace-context`](../packages/context/workspace-context) |
+| `session/event` | `emit` | [`packages/core/session/src/index.ts:92`](../packages/core/session/src/index.ts) | [`session`](../packages/core/session) (`events.dispatch`) | [`acp`](../packages/acp/acp), `apiproxy`, [`cli-demo`](../packages/examples/cli-demo), [`compact`](../packages/compact/compact), [`compact-basic`](../packages/compact/compact-basic), [`goal`](../packages/goal/goal), [`goal-session`](../packages/goal/goal-session), [`hook-protocol`](../packages/hooks/hook-protocol), [`jsonrpc`](../packages/ui/jsonrpc), [`llm-retry`](../packages/llm/llm-retry), [`session`](../packages/core/session), [`session-persistence`](../packages/session-persistence/session-persistence), [`session-projection`](../packages/session-projection/session-projection), [`session-telemetry`](../packages/telemetry/session-telemetry), [`session-title`](../packages/session-title/session-title), [`token-meter`](../packages/llm/token-meter), [`tui`](../packages/ui/tui), [`user-approval`](../packages/ui/user-approval), [`workspace-context`](../packages/context/workspace-context) |
 | `session/flush` | `parallel` | [`packages/core/session/src/index.ts:102`](../packages/core/session/src/index.ts) | [`session`](../packages/core/session) (`events.dispatch`) | [`session-persistence`](../packages/session-persistence/session-persistence), [`session-telemetry`](../packages/telemetry/session-telemetry) |
 | `slash/input-begin-command` | `bail` | [`packages/client/ui-slash/src/types.ts:220`](../packages/client/ui-slash/src/types.ts) | - | `ui-conversation` |
 | `slash/input-consume-token` | `bail` | [`packages/client/ui-slash/src/types.ts:234`](../packages/client/ui-slash/src/types.ts) | - | `ui-conversation` |
@@ -65,7 +65,7 @@ This matrix shows which packages dispatch each harness-owned event and which pac
 | --- | --- | --- |
 | `commands/changed` | `runtime` (`emit`) | - |
 | `connection/reset` | `runtime` (`emit`) | - |
-| `internal/dispatch` | - | [`compact`](../packages/compact/compact), [`fs`](../packages/fs/fs), [`goal`](../packages/goal/goal), [`goal-session`](../packages/goal/goal-session), [`hook-protocol`](../packages/hooks/hook-protocol), [`llm-retry`](../packages/llm/llm-retry), [`permission`](../packages/ui/permission), [`plan-mode`](../packages/plan/plan-mode), [`pty-local`](../packages/pty/pty-local), `runtime`, [`sandbox-policy`](../packages/sandbox/sandbox-policy), [`scope`](../packages/core/scope), [`session`](../packages/core/session), [`subagent`](../packages/subagent/subagent), [`time-context`](../packages/context/time-context), [`tool-todo`](../packages/todo/tool-todo), [`tools`](../packages/core/tools), [`user-approval`](../packages/ui/user-approval), [`workflow`](../packages/workflow/workflow) |
+| `internal/dispatch` | - | [`commands`](../packages/ui/commands), [`compact`](../packages/compact/compact), [`fs`](../packages/fs/fs), [`goal`](../packages/goal/goal), [`goal-session`](../packages/goal/goal-session), [`hook-protocol`](../packages/hooks/hook-protocol), [`llm-retry`](../packages/llm/llm-retry), [`permission`](../packages/ui/permission), [`plan-mode`](../packages/plan/plan-mode), [`pty-local`](../packages/pty/pty-local), `runtime`, [`sandbox-policy`](../packages/sandbox/sandbox-policy), [`scope`](../packages/core/scope), [`session`](../packages/core/session), [`subagent`](../packages/subagent/subagent), [`time-context`](../packages/context/time-context), [`tool-todo`](../packages/todo/tool-todo), [`tools`](../packages/core/tools), [`user-approval`](../packages/ui/user-approval), [`workflow`](../packages/workflow/workflow) |
 | `internal/plugin` | - | `hmr`, `modules`, `webserver` |
 | `internal/status` | - | [`agent`](../packages/core/agent) |
 | `locale/change` | `locale` (`emit`) | `locale`, `ui-models`, `ui-settings-general` |
diff --git a/docs/module-graph.md b/docs/module-graph.md
index 445d25c235..a5f1d947d8 100644
--- a/docs/module-graph.md
+++ b/docs/module-graph.md
@@ -205,6 +205,9 @@ flowchart TD
     pkg_scripts["scripts"]
     pkg_telemetry["telemetry"]
   end
+  subgraph group_session_projection["packages/session-projection"]
+    pkg_session_projection["session-projection"]
+  end
   subgraph group_storage["packages/storage"]
     pkg_storage["storage"]
     pkg_storage_domain["storage-domain"]
@@ -382,10 +385,6 @@ flowchart TD
   pkg_session_persistence --> pkg_brand
   pkg_session_persistence --> pkg_invariants
   pkg_session_persistence --> pkg_session
-  pkg_session_title --> pkg_brand
-  pkg_session_title --> pkg_invariants
-  pkg_session_title --> pkg_llm
-  pkg_session_title --> pkg_session
   pkg_llm_replay --> pkg_invariants
   pkg_llm_replay --> pkg_llm
   pkg_llm_replay --> pkg_session
@@ -418,6 +417,8 @@ flowchart TD
   pkg_sandbox_policy --> pkg_invariants
   pkg_sandbox_policy --> pkg_sandbox
   pkg_sandbox_policy --> pkg_session
+  pkg_session_projection --> pkg_invariants
+  pkg_session_projection --> pkg_session
   pkg_llm_retry --> pkg_agent
   pkg_llm_retry --> pkg_invariants
   pkg_llm_retry --> pkg_llm
@@ -459,20 +460,15 @@ flowchart TD
   pkg_session_persistence_sqlite --> pkg_invariants
   pkg_session_persistence_sqlite --> pkg_session
   pkg_session_persistence_sqlite --> pkg_session_persistence
-  pkg_session_query --> pkg_brand
-  pkg_session_query --> pkg_invariants
-  pkg_session_query --> pkg_llm
-  pkg_session_query --> pkg_session
-  pkg_session_query --> pkg_session_persistence
-  pkg_session_query --> pkg_session_title
-  pkg_session_title_llm --> pkg_invariants
-  pkg_session_title_llm --> pkg_llm
-  pkg_session_title_llm --> pkg_session
-  pkg_session_title_llm --> pkg_session_title
-  pkg_session_title_llm --> pkg_timeout
+  pkg_session_title --> pkg_brand
+  pkg_session_title --> pkg_invariants
+  pkg_session_title --> pkg_llm
+  pkg_session_title --> pkg_session
+  pkg_session_title --> pkg_session_projection
   pkg_commands --> pkg_agent
   pkg_commands --> pkg_invariants
   pkg_commands --> pkg_scope
+  pkg_commands --> pkg_session
   pkg_user_approval --> pkg_agent
   pkg_user_approval --> pkg_brand
   pkg_user_approval --> pkg_invariants
@@ -535,20 +531,17 @@ flowchart TD
   pkg_fs_sandbox --> pkg_invariants
   pkg_fs_sandbox --> pkg_sandbox
   pkg_fs_sandbox --> pkg_sandbox_policy
-  pkg_session_query_sqlite --> pkg_invariants
-  pkg_session_query_sqlite --> pkg_session
-  pkg_session_query_sqlite --> pkg_session_persistence
-  pkg_session_query_sqlite --> pkg_session_query
-  pkg_session_title_all_messages_llm --> pkg_invariants
-  pkg_session_title_all_messages_llm --> pkg_llm
-  pkg_session_title_all_messages_llm --> pkg_session
-  pkg_session_title_all_messages_llm --> pkg_session_title
-  pkg_session_title_all_messages_llm --> pkg_session_title_llm
-  pkg_session_title_first_message_llm --> pkg_invariants
-  pkg_session_title_first_message_llm --> pkg_llm
-  pkg_session_title_first_message_llm --> pkg_session
-  pkg_session_title_first_message_llm --> pkg_session_title
-  pkg_session_title_first_message_llm --> pkg_session_title_llm
+  pkg_session_query --> pkg_brand
+  pkg_session_query --> pkg_invariants
+  pkg_session_query --> pkg_llm
+  pkg_session_query --> pkg_session
+  pkg_session_query --> pkg_session_persistence
+  pkg_session_query --> pkg_session_title
+  pkg_session_title_llm --> pkg_invariants
+  pkg_session_title_llm --> pkg_llm
+  pkg_session_title_llm --> pkg_session
+  pkg_session_title_llm --> pkg_session_title
+  pkg_session_title_llm --> pkg_timeout
   pkg_acp --> pkg_agent
   pkg_acp --> pkg_invariants
   pkg_acp --> pkg_session
@@ -559,13 +552,6 @@ flowchart TD
   pkg_permission --> pkg_sandbox_policy
   pkg_permission --> pkg_session
   pkg_permission --> pkg_user_approval
-  pkg_session_reference --> pkg_agent
-  pkg_session_reference --> pkg_compact
-  pkg_session_reference --> pkg_invariants
-  pkg_session_reference --> pkg_llm
-  pkg_session_reference --> pkg_retention
-  pkg_session_reference --> pkg_session
-  pkg_session_reference --> pkg_session_query
   pkg_pty_local --> pkg_agent
   pkg_pty_local --> pkg_invariants
   pkg_pty_local --> pkg_pty
@@ -655,6 +641,7 @@ flowchart TD
   pkg_tool_todo --> pkg_agent
   pkg_tool_todo --> pkg_invariants
   pkg_tool_todo --> pkg_session
+  pkg_tool_todo --> pkg_session_projection
   pkg_tool_todo --> pkg_tools
   pkg_plan_mode --> pkg_agent
   pkg_plan_mode --> pkg_commands
@@ -679,6 +666,10 @@ flowchart TD
   pkg_session_checkpoint_policy --> pkg_session
   pkg_session_checkpoint_policy --> pkg_session_persistence
   pkg_session_checkpoint_policy --> pkg_tools
+  pkg_session_query_sqlite --> pkg_invariants
+  pkg_session_query_sqlite --> pkg_session
+  pkg_session_query_sqlite --> pkg_session_persistence
+  pkg_session_query_sqlite --> pkg_session_query
   pkg_tool_session_query --> pkg_invariants
   pkg_tool_session_query --> pkg_llm
   pkg_tool_session_query --> pkg_session
@@ -686,6 +677,16 @@ flowchart TD
   pkg_tool_session_query --> pkg_system_prompt
   pkg_tool_session_query --> pkg_timeout
   pkg_tool_session_query --> pkg_tools
+  pkg_session_title_all_messages_llm --> pkg_invariants
+  pkg_session_title_all_messages_llm --> pkg_llm
+  pkg_session_title_all_messages_llm --> pkg_session
+  pkg_session_title_all_messages_llm --> pkg_session_title
+  pkg_session_title_all_messages_llm --> pkg_session_title_llm
+  pkg_session_title_first_message_llm --> pkg_invariants
+  pkg_session_title_first_message_llm --> pkg_llm
+  pkg_session_title_first_message_llm --> pkg_session
+  pkg_session_title_first_message_llm --> pkg_session_title
+  pkg_session_title_first_message_llm --> pkg_session_title_llm
   pkg_agent_loop_testkit --> pkg_agent
   pkg_agent_loop_testkit --> pkg_invariants
   pkg_agent_loop_testkit --> pkg_llm
@@ -696,6 +697,13 @@ flowchart TD
   pkg_tool_ask_user --> pkg_invariants
   pkg_tool_ask_user --> pkg_tools
   pkg_tool_ask_user --> pkg_user_interaction
+  pkg_session_reference --> pkg_agent
+  pkg_session_reference --> pkg_compact
+  pkg_session_reference --> pkg_invariants
+  pkg_session_reference --> pkg_llm
+  pkg_session_reference --> pkg_retention
+  pkg_session_reference --> pkg_session
+  pkg_session_reference --> pkg_session_query
   pkg_workspace_context --> pkg_agent
   pkg_workspace_context --> pkg_fs
   pkg_workspace_context --> pkg_invariants
@@ -936,7 +944,6 @@ flowchart TD
 | [`web-search-perplexity`](../packages/web/web-search-perplexity) | `web` | [`invariants`](../packages/support/invariants), [`web`](../packages/web/web) |
 | [`spill`](../packages/spill/spill) | `spill` | [`brand`](../packages/util/brand), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`session`](../packages/core/session) |
 | [`session-persistence`](../packages/session-persistence/session-persistence) | `session-persistence` | [`brand`](../packages/util/brand), [`invariants`](../packages/support/invariants), [`session`](../packages/core/session) |
-| [`session-title`](../packages/session-title/session-title) | `session-title` | [`brand`](../packages/util/brand), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`session`](../packages/core/session) |
 | [`llm-replay`](../packages/support/llm-replay) | `support` | [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`session`](../packages/core/session) |
 | [`app-boot`](../packages/ui/app-boot) | `ui` | [`invariants`](../packages/support/invariants), [`paths`](../packages/util/paths), [`system-prompt`](../packages/core/system-prompt) |
 | [`client-ui-command`](../packages/client/ui-command) | `client` | [`client-connection`](../packages/client/connection), [`client-runtime`](../packages/client/runtime), [`client-ui-conversation`](../packages/client/ui-conversation), [`client-ui-primitives`](../packages/client/ui-primitives), [`client-ui-slash`](../packages/client/ui-slash), [`client-ui-slots`](../packages/client/ui-slots), [`invariants`](../packages/support/invariants) |
@@ -945,6 +952,7 @@ flowchart TD
 | [`lsp-local`](../packages/lsp/lsp-local) | `lsp` | [`brand`](../packages/util/brand), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`lsp`](../packages/lsp/lsp), [`subprocess`](../packages/subprocess/subprocess), [`timeout`](../packages/util/timeout) |
 | [`sandbox-local`](../packages/sandbox/sandbox-local) | `sandbox` | [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`sandbox`](../packages/sandbox/sandbox) |
 | [`sandbox-policy`](../packages/sandbox/sandbox-policy) | `sandbox` | [`invariants`](../packages/support/invariants), [`sandbox`](../packages/sandbox/sandbox), [`session`](../packages/core/session) |
+| [`session-projection`](../packages/session-projection/session-projection) | `session-projection` | [`invariants`](../packages/support/invariants), [`session`](../packages/core/session) |
 | [`llm-retry`](../packages/llm/llm-retry) | `llm` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`session`](../packages/core/session), [`timeout`](../packages/util/timeout) |
 | [`goal`](../packages/goal/goal) | `goal` | [`agent`](../packages/core/agent), [`brand`](../packages/util/brand), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`scope`](../packages/core/scope), [`session`](../packages/core/session) |
 | [`bash-local`](../packages/bash/bash-local) | `bash` | [`bash`](../packages/bash/bash), [`invariants`](../packages/support/invariants), [`subprocess`](../packages/subprocess/subprocess), [`timeout`](../packages/util/timeout) |
@@ -956,9 +964,8 @@ flowchart TD
 | [`hook-protocol`](../packages/hooks/hook-protocol) | `hooks` | [`bash`](../packages/bash/bash), [`invariants`](../packages/support/invariants), [`session`](../packages/core/session) |
 | [`session-persistence-jsonl`](../packages/session-persistence/session-persistence-jsonl) | `session-persistence` | [`invariants`](../packages/support/invariants), [`session`](../packages/core/session), [`session-persistence`](../packages/session-persistence/session-persistence) |
 | [`session-persistence-sqlite`](../packages/session-persistence/session-persistence-sqlite) | `session-persistence` | [`invariants`](../packages/support/invariants), [`session`](../packages/core/session), [`session-persistence`](../packages/session-persistence/session-persistence) |
-| [`session-query`](../packages/session-query/session-query) | `session-query` | [`brand`](../packages/util/brand), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`session`](../packages/core/session), [`session-persistence`](../packages/session-persistence/session-persistence), [`session-title`](../packages/session-title/session-title) |
-| [`session-title-llm`](../packages/session-title/session-title-llm) | `session-title` | [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`session`](../packages/core/session), [`session-title`](../packages/session-title/session-title), [`timeout`](../packages/util/timeout) |
-| [`commands`](../packages/ui/commands) | `ui` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`scope`](../packages/core/scope) |
+| [`session-title`](../packages/session-title/session-title) | `session-title` | [`brand`](../packages/util/brand), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`session`](../packages/core/session), [`session-projection`](../packages/session-projection/session-projection) |
+| [`commands`](../packages/ui/commands) | `ui` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`scope`](../packages/core/scope), [`session`](../packages/core/session) |
 | [`user-approval`](../packages/ui/user-approval) | `ui` | [`agent`](../packages/core/agent), [`brand`](../packages/util/brand), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`scope`](../packages/core/scope), [`session`](../packages/core/session), [`system-prompt`](../packages/core/system-prompt) |
 | [`user-interaction`](../packages/ui/user-interaction) | `ui` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm) |
 | [`time-context`](../packages/context/time-context) | `context` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`session`](../packages/core/session) |
@@ -973,12 +980,10 @@ flowchart TD
 | [`goal-session`](../packages/goal/goal-session) | `goal` | [`agent`](../packages/core/agent), [`goal`](../packages/goal/goal), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`session`](../packages/core/session) |
 | [`bash-sandbox`](../packages/bash/bash-sandbox) | `bash` | [`bash`](../packages/bash/bash), [`bash-local`](../packages/bash/bash-local), [`invariants`](../packages/support/invariants), [`sandbox`](../packages/sandbox/sandbox), [`sandbox-policy`](../packages/sandbox/sandbox-policy) |
 | [`fs-sandbox`](../packages/fs/fs-sandbox) | `fs` | [`fs`](../packages/fs/fs), [`fs-local`](../packages/fs/fs-local), [`invariants`](../packages/support/invariants), [`sandbox`](../packages/sandbox/sandbox), [`sandbox-policy`](../packages/sandbox/sandbox-policy) |
-| [`session-query-sqlite`](../packages/session-query/session-query-sqlite) | `session-query` | [`invariants`](../packages/support/invariants), [`session`](../packages/core/session), [`session-persistence`](../packages/session-persistence/session-persistence), [`session-query`](../packages/session-query/session-query) |
-| [`session-title-all-messages-llm`](../packages/session-title/session-title-all-messages-llm) | `session-title` | [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`session`](../packages/core/session), [`session-title`](../packages/session-title/session-title), [`session-title-llm`](../packages/session-title/session-title-llm) |
-| [`session-title-first-message-llm`](../packages/session-title/session-title-first-message-llm) | `session-title` | [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`session`](../packages/core/session), [`session-title`](../packages/session-title/session-title), [`session-title-llm`](../packages/session-title/session-title-llm) |
+| [`session-query`](../packages/session-query/session-query) | `session-query` | [`brand`](../packages/util/brand), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`session`](../packages/core/session), [`session-persistence`](../packages/session-persistence/session-persistence), [`session-title`](../packages/session-title/session-title) |
+| [`session-title-llm`](../packages/session-title/session-title-llm) | `session-title` | [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`session`](../packages/core/session), [`session-title`](../packages/session-title/session-title), [`timeout`](../packages/util/timeout) |
 | [`acp`](../packages/acp/acp) | `acp` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`session`](../packages/core/session), [`user-approval`](../packages/ui/user-approval) |
 | [`permission`](../packages/ui/permission) | `ui` | [`bash`](../packages/bash/bash), [`invariants`](../packages/support/invariants), [`sandbox`](../packages/sandbox/sandbox), [`sandbox-policy`](../packages/sandbox/sandbox-policy), [`session`](../packages/core/session), [`user-approval`](../packages/ui/user-approval) |
-| [`session-reference`](../packages/context/session-reference) | `context` | [`agent`](../packages/core/agent), [`compact`](../packages/compact/compact), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`retention`](../packages/util/retention), [`session`](../packages/core/session), [`session-query`](../packages/session-query/session-query) |
 | [`pty-local`](../packages/pty/pty-local) | `pty` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`pty`](../packages/pty/pty), [`sandbox`](../packages/sandbox/sandbox), [`sandbox-policy`](../packages/sandbox/sandbox-policy), [`session`](../packages/core/session), [`subprocess`](../packages/subprocess/subprocess) |
 | [`tasks-local`](../packages/tasks/tasks-local) | `tasks` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`tasks`](../packages/tasks/tasks), [`timeout`](../packages/util/timeout) |
 | [`session-telemetry-otel`](../packages/telemetry/session-telemetry-otel) | `telemetry` | [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`session`](../packages/core/session), [`session-telemetry`](../packages/telemetry/session-telemetry) |
@@ -992,14 +997,18 @@ flowchart TD
 | [`tool-web`](../packages/web/tool-web) | `web` | [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`system-prompt`](../packages/core/system-prompt), [`tools`](../packages/core/tools), [`web`](../packages/web/web) |
 | [`spill-policy`](../packages/spill/spill-policy) | `spill` | [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`retention`](../packages/util/retention), [`session`](../packages/core/session), [`spill`](../packages/spill/spill), [`tools`](../packages/core/tools) |
 | [`timeout-policy`](../packages/timeout/timeout-policy) | `timeout` | [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`timeout`](../packages/util/timeout), [`tools`](../packages/core/tools) |
-| [`tool-todo`](../packages/todo/tool-todo) | `todo` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`session`](../packages/core/session), [`tools`](../packages/core/tools) |
+| [`tool-todo`](../packages/todo/tool-todo) | `todo` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`session`](../packages/core/session), [`session-projection`](../packages/session-projection/session-projection), [`tools`](../packages/core/tools) |
 | [`plan-mode`](../packages/plan/plan-mode) | `plan` | [`agent`](../packages/core/agent), [`commands`](../packages/ui/commands), [`invariants`](../packages/support/invariants), [`session`](../packages/core/session), [`system-prompt`](../packages/core/system-prompt), [`tools`](../packages/core/tools), [`user-interaction`](../packages/ui/user-interaction) |
 | [`tool-cordis`](../packages/cordis/tool-cordis) | `cordis` | [`invariants`](../packages/support/invariants), [`scope`](../packages/core/scope), [`tools`](../packages/core/tools) |
 | [`hooks-codex`](../packages/hooks/hooks-codex) | `hooks` | [`agent`](../packages/core/agent), [`hook-protocol`](../packages/hooks/hook-protocol), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`session`](../packages/core/session), [`session-persistence`](../packages/session-persistence/session-persistence), [`tools`](../packages/core/tools) |
 | [`session-checkpoint-policy`](../packages/session-persistence/session-checkpoint-policy) | `session-persistence` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`session`](../packages/core/session), [`session-persistence`](../packages/session-persistence/session-persistence), [`tools`](../packages/core/tools) |
+| [`session-query-sqlite`](../packages/session-query/session-query-sqlite) | `session-query` | [`invariants`](../packages/support/invariants), [`session`](../packages/core/session), [`session-persistence`](../packages/session-persistence/session-persistence), [`session-query`](../packages/session-query/session-query) |
 | [`tool-session-query`](../packages/session-query/tool-session-query) | `session-query` | [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`session`](../packages/core/session), [`session-query`](../packages/session-query/session-query), [`system-prompt`](../packages/core/system-prompt), [`timeout`](../packages/util/timeout), [`tools`](../packages/core/tools) |
+| [`session-title-all-messages-llm`](../packages/session-title/session-title-all-messages-llm) | `session-title` | [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`session`](../packages/core/session), [`session-title`](../packages/session-title/session-title), [`session-title-llm`](../packages/session-title/session-title-llm) |
+| [`session-title-first-message-llm`](../packages/session-title/session-title-first-message-llm) | `session-title` | [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`session`](../packages/core/session), [`session-title`](../packages/session-title/session-title), [`session-title-llm`](../packages/session-title/session-title-llm) |
 | [`agent-loop-testkit`](../packages/support/agent-loop-testkit) | `support` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`session`](../packages/core/session), [`system-prompt`](../packages/core/system-prompt), [`tools`](../packages/core/tools) |
 | [`tool-ask-user`](../packages/ui/tool-ask-user) | `ui` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`tools`](../packages/core/tools), [`user-interaction`](../packages/ui/user-interaction) |
+| [`session-reference`](../packages/context/session-reference) | `context` | [`agent`](../packages/core/agent), [`compact`](../packages/compact/compact), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`retention`](../packages/util/retention), [`session`](../packages/core/session), [`session-query`](../packages/session-query/session-query) |
 | [`workspace-context`](../packages/context/workspace-context) | `context` | [`agent`](../packages/core/agent), [`fs`](../packages/fs/fs), [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`paths`](../packages/util/paths), [`session`](../packages/core/session), [`tools`](../packages/core/tools) |
 | [`repeat-tool-guard`](../packages/guard/repeat-tool-guard) | `guard` | [`agent`](../packages/core/agent), [`invariants`](../packages/support/invariants), [`tools`](../packages/core/tools) |
 | [`tool-lsp`](../packages/lsp/tool-lsp) | `lsp` | [`invariants`](../packages/support/invariants), [`llm`](../packages/llm/llm), [`lsp`](../packages/lsp/lsp), [`system-prompt`](../packages/core/system-prompt), [`timeout`](../packages/util/timeout), [`tools`](../packages/core/tools) |
diff --git a/docs/persistence-catalog.md b/docs/persistence-catalog.md
index 013778b633..d58869210a 100644
--- a/docs/persistence-catalog.md
+++ b/docs/persistence-catalog.md
@@ -168,6 +168,38 @@ Types: [ContentBlock](core-data-structures/core.md) · [TokenUsage](core-data-st
 
 Source: [`packages/core/session/src/types.ts:222`](../packages/core/session/src/types.ts)
 
+### `command/*`
+
+#### `command/done` — log-only
+
+```ts persistence-catalog
+/**
+ * The paired command settled. `kind`/`text` carry the handler's verbatim
+ * outcome (a thrown/aborted handler settles as `kind: 'error'` with the
+ * rendered failure); presentation stays client-computed at render time.
+ */
+'command/done': { commandId: string; kind: 'success' | 'error'; text?: string }
+```
+
+Source: [`packages/ui/commands/src/index.ts:140`](../packages/ui/commands/src/index.ts)
+
+#### `command/run` — log-only
+
+```ts persistence-catalog
+/**
+ * A resolved slash command entered its handler. Log-only (never model
+ * surface); paired with `command/done` by `commandId`, mirroring the
+ * `tool/call`↔`tool/result` pairing. The payload is structured — `name`
+ * and `args` are `parseCommand`'s own split (name and verbatim rawInput,
+ * separator whitespace included), so a consumer (a projection unit
+ * folding its own command records, a rich command card) never re-parses
+ * a line.
+ */
+'command/run': { commandId: string; name: string; args: string; source: CommandSource }
+```
+
+Source: [`packages/ui/commands/src/index.ts:134`](../packages/ui/commands/src/index.ts)
+
 ### `compact/*`
 
 #### `compact/end` — log-only
@@ -361,7 +393,7 @@ Source: [`packages/sandbox/sandbox-policy/src/session-mode.ts:34`](../packages/s
 
 Types: [SessionTitleEventData](core-data-structures/session-title.md)
 
-Source: [`packages/session-title/session-title/src/index.ts:95`](../packages/session-title/session-title/src/index.ts)
+Source: [`packages/session-title/session-title/src/index.ts:103`](../packages/session-title/session-title/src/index.ts)
 
 #### `session/title-llm-request` — log-only
 
diff --git a/packages/README.md b/packages/README.md
index 65d5c38a39..f5420b6f2f 100644
--- a/packages/README.md
+++ b/packages/README.md
@@ -28,22 +28,22 @@ Packages live at `packages/<group>/<pkg>/`; groups are containers, while names r
 | [`workflow/`](workflow/README.md) | Workflow capability family: the script-engine seam, worker-thread engine, and model-facing `workflow` and fresh-agent `ralph` tools | Product — stable surface |
 | [`web/`](web/README.md) | Web capability family: seam, search/fetch provider impls, and the model-facing web tools | Product — stable surface |
 | [`spill/`](spill/README.md) | Spill capability family: storage seam, local impl, tool-result spill policy | Product — stable surface |
-| [`todo/`](todo/README.md) | Todo/planning family: the model-facing `todo_write` tool | Product — stable surface |
+| [`todo/`](todo/README.md) | The model-facing `todo_write` tool | Product — stable surface |
 | [`plan/`](plan/README.md) | Plan collaboration state with a direct entry command and reviewed exit | Product — stable surface |
 | [`timeout/`](timeout/README.md) | Tool-call timeout policy: the `tools/execute` deadline enforcer | Product — stable surface |
 | [`guard/`](guard/README.md) | Loop-hygiene guards: advisory repeat-call reminders | Product — stable surface |
 | [`cordis/`](cordis/README.md) | Self-referential runtime toolset: inspect the live runtime's plugins and services, mount/unmount model-written plugins ([design](../.agents/notes/implemented/feature/2026-07-08-self-referential-cordis-toolset.md)) | Product — stable surface |
 | [`hooks/`](hooks/README.md) | Hook bridges + the shared Claude Code / Codex wire-protocol library | Product — stable surface |
-| [`session-persistence/`](session-persistence/README.md) | Persistence capability family: the seam + JSONL/SQLite backends | Product — stable surface |
-| [`session-projection/`](session-projection/README.md) | Session-projection seam: domain host plugins serve whole current values of log-derived per-session state to client carriers | Product — stable surface |
+| [`session-persistence/`](session-persistence/README.md) | Persistence seam + JSONL/SQLite backends | Product — stable surface |
+| [`session-projection/`](session-projection/README.md) | Projection seam: domain fold units serve whole values | Product — stable surface |
 | [`session-query/`](session-query/README.md) | Session retrieval family: logical corpus, bounded reads, lineage, event relationships, semantic filtering, and SQLite full-text search | Product — stable surface |
-| [`session-title/`](session-title/README.md) | Log-backed session titles: fallback service, shared LLM policy, and opt-in providers | Product — stable surface |
+| [`session-title/`](session-title/README.md) | Log-backed session titles: fallback service and opt-in LLM providers | Product — stable surface |
 | [`telemetry/`](telemetry/README.md) | Session reporting: capture/redact seam, OTel backend | Product — stable surface |
 | [`storage/`](storage/README.md) | Non-session storage hub + backends + domain form | Product — stable surface |
 | [`workspace/`](workspace/README.md) | Workspace entity | Product — stable surface |
 | [`sdk/`](sdk/README.md) | Project SDK tooling | Product — stable surface |
 | [`acp/`](acp/README.md) | Automation-only Agent Client Protocol server | Product — stable surface |
-| [`ui/`](ui/README.md) | Human/client integrations: TUI and JSON-RPC, approval/interaction seams, ask-user tool | Product — stable surface |
+| [`ui/`](ui/README.md) | TUI and JSON-RPC integrations, approval/interaction seams, ask-user tool | Product — stable surface |
 | [`examples/`](examples/README.md) | Demo bundles (agent-spine + TUI/CLI/ACP/JSON-RPC bins) leaves load | Support — example infra |
 | [`support/`](support/README.md) | Support infrastructure (testkits, invariants, replay, Loader smokes) | Support — lower compatibility expectations |
 | [`util/`](util/README.md) | Low-level zero-dependency utilities shared across groups (`Branded<B>`, Harness home/path helpers, timeout, retention) | Support — small, stable, harness-dep-free |
diff --git a/packages/cordis/tool-cordis/src/api-catalog.ts b/packages/cordis/tool-cordis/src/api-catalog.ts
index 14198b7119..fe742bceac 100644
--- a/packages/cordis/tool-cordis/src/api-catalog.ts
+++ b/packages/cordis/tool-cordis/src/api-catalog.ts
@@ -241,8 +241,8 @@ export const SERVICE_API: readonly ServiceApiEntry[] = [
         jsDoc: '/**\n * Resolve one effective command definition.\n * @param agent - exact receiving agent and scoped-layer key.\n * @param name - command name without a slash.\n * @returns the scoped shadow or global definition.\n */',
       },
       {
-        signature: 'async execute( agent: Agent, line: string, signal: AbortSignal, ): Promise<CommandResult | undefined>',
-        jsDoc: '/**\n * Parse and execute a known command without sending it to the model.\n * @param agent - exact receiving agent.\n * @param line - complete slash-command line.\n * @param signal - cancellation signal owned by the UI request.\n * @returns a detached result, or `undefined` when syntax or name does not resolve.\n */',
+        signature: 'async execute( agent: Agent, line: string, signal: AbortSignal, ): Promise<CommandExecution | undefined>',
+        jsDoc: '/**\n * Parse and execute a known command without sending it to the model.\n *\n * A resolved command\'s lifecycle is durably logged: `command/run` is\n * appended before the handler is invoked and `command/done` after\n * settlement (a thrown or aborted handler settles as `kind: \'error\'`).\n * Admission misses (syntax or unknown name) log nothing — they never\n * entered a handler. A `command/run` append failure fails the execution\n * loud; a `command/done` append failure on the handler-failure path is\n * contained so the handler\'s own error stays the reported failure.\n *\n * @param agent - exact receiving agent.\n * @param line - complete slash-command line.\n * @param signal - cancellation signal owned by the UI request.\n * @returns the settled execution (result + lifecycle pairing id), or\n *   `undefined` when syntax or name does not resolve.\n */',
       },
     ],
   },
@@ -530,6 +530,24 @@ export const SERVICE_API: readonly ServiceApiEntry[] = [
       },
     ],
   },
+  {
+    key: 'sessionProjections',
+    summary: '`ctx.sessionProjections`: the projection unit table and its drive.',
+    methods: [
+      {
+        signature: 'register<K extends keyof SessionProjectionMap, S>(definition: ProjectionDefinition<K, S>): () => void',
+        jsDoc: '/**\n * Register one domain\'s unit. The registration is an effect on the calling\n * context\'s fiber: disposing the fiber (or calling the returned disposer)\n * removes the key — and the unit\'s cached cells — from subsequent drives\n * and snapshots.\n * @param definition - key, boundary schema, pure unit functions, and stateVersion.\n * @returns the exact disposer that unregisters this unit.\n */',
+      },
+      {
+        signature: 'onChanged(listener: ProjectionChangeListener): () => void',
+        jsDoc: '/**\n * Subscribe to the change feed. The registration is an effect on the\n * calling context\'s fiber.\n * @param listener - called once per unit whose state reference changed, per committed event.\n * @returns the exact disposer that unsubscribes.\n */',
+      },
+      {
+        signature: 'snapshot(session: Session): ProjectionSnapshot',
+        jsDoc: '/**\n * One consistent cut over every registered unit for one session, read from\n * the watermark cache (missing cells fold lazily over the in-memory log).\n * Fully synchronous — every value and `asOfSeq` reflect the same log\n * position. Each value passes its unit\'s schema before leaving.\n * @param session - the session whose projection values are read.\n * @returns the snapshot; `values` is empty when no unit is registered.\n */',
+      },
+    ],
+  },
   {
     key: 'sessionQuery',
     summary: 'Unified live-preferred session query service.',
@@ -1517,6 +1535,10 @@ export const TYPE_API: readonly TypeApiEntry[] = [
     name: 'CommandDescriptor',
     declaration: 'export interface CommandDescriptor {\n    readonly name: string;\n    readonly description: string;\n    readonly input?: CommandInputDescriptor;\n}',
   },
+  {
+    name: 'CommandExecution',
+    declaration: 'export interface CommandExecution {\n    readonly commandId: string;\n    readonly result: CommandResult;\n}',
+  },
   {
     name: 'CommandInputDescriptor',
     declaration: 'export interface CommandInputDescriptor {\n    readonly hint: string;\n}',
@@ -1825,6 +1847,18 @@ export const TYPE_API: readonly TypeApiEntry[] = [
     name: 'PresetSpec',
     declaration: 'export interface PresetSpec {\n    sandbox: SandboxMode;\n    approval: ApprovalPolicy;\n    name?: string;\n    description?: string;\n}',
   },
+  {
+    name: 'ProjectionChangeListener',
+    declaration: 'export type ProjectionChangeListener = (session: Session, key: keyof SessionProjectionMap & string, value: unknown, seq: number) => void;',
+  },
+  {
+    name: 'ProjectionDefinition',
+    declaration: 'export interface ProjectionDefinition<K extends keyof SessionProjectionMap, S> {\n    key: K;\n    schema: ZodType<SessionProjectionMap[K]>;\n    init(): S;\n    apply(state: S, event: SessionEvent): S;\n    view(state: S): SessionProjectionMap[K];\n    stateVersion: number;\n}',
+  },
+  {
+    name: 'ProjectionSnapshot',
+    declaration: 'export interface ProjectionSnapshot {\n    asOfSeq: number;\n    values: Partial<SessionProjectionMap>;\n}',
+  },
   {
     name: 'PromptAssembly',
     declaration: 'export interface PromptAssembly {\n    sections: AssembledSection[];\n    tools: ToolSchema[];\n    variables: Record<string, string | undefined>;\n}',
@@ -2077,6 +2111,10 @@ export const TYPE_API: readonly TypeApiEntry[] = [
     name: 'SessionPersistenceSnapshot',
     declaration: 'export interface SessionPersistenceSnapshot {\n    header: SessionHeader;\n    revision: SessionPersistenceRevision;\n}',
   },
+  {
+    name: 'SessionProjectionMap',
+    declaration: 'export interface SessionProjectionMap {\n}',
+  },
   {
     name: 'SessionRecord',
     declaration: 'export interface SessionRecord {\n    header: SessionHeader;\n    live: boolean;\n    persisted: boolean;\n}',
diff --git a/scripts/gen-cordis-catalog.ts b/scripts/gen-cordis-catalog.ts
index 5470ec01e7..d2fc0dff71 100644
--- a/scripts/gen-cordis-catalog.ts
+++ b/scripts/gen-cordis-catalog.ts
@@ -233,6 +233,11 @@ const TYPE_LINK_EXEMPTIONS: Readonly<Record<string, string>> = {
   DomainSpec: 'domain declaration contract is owned by packages/storage/storage-domain/README.md',
   StorageBackend: 'backend contract is owned by packages/storage/storage/src/backend.ts',
   StorageForms: 'merge-extensible form map is owned by packages/storage/storage/src/index.ts',
+  ProjectionDefinition: 'projection unit contract is owned by packages/session-projection/session-projection/README.md',
+  SessionProjectionMap: 'merge-extensible projection key map is owned by packages/session-projection/session-projection/src/types.ts',
+  ProjectionChangeListener: 'change-feed listener contract is owned by packages/session-projection/session-projection/src/index.ts',
+  ProjectionSnapshot: 'watermark snapshot shape is owned by packages/session-projection/session-projection/src/index.ts',
+  CommandExecution: 'executor return contract is owned by packages/ui/commands/src/index.ts',
   InvariantInstaller: 'service-local contribution contract is owned by packages/support/invariants/README.md',
   LocaleDict: 'service-local dictionary shape is owned by packages/client/i18n/src/index.ts',
   WebBootGraph: 'web boot graph wire shape is owned by packages/client/modules/src/client/index.ts',
diff --git a/scripts/gen-doc-graphs.ts b/scripts/gen-doc-graphs.ts
index 065e00fd20..464995409c 100644
--- a/scripts/gen-doc-graphs.ts
+++ b/scripts/gen-doc-graphs.ts
@@ -236,6 +236,14 @@ const SERVICE_ROLES: ServiceRole[] = [
     consumers: ['tui'],
     note: 'Plugins register direct human commands; TUI consumes the effective per-agent catalog without sending invocations to the model.',
   },
+  {
+    key: 'sessionProjections',
+    pkg: 'session-projection',
+    title: 'Session projection units',
+    mode: 'core',
+    consumers: ['tool-todo', 'session-title', 'host-apiproxy'],
+    note: 'Domains register state-driven fold units; the eager drive keeps per-session watermark states and api-proxy serves baselines and pushes changed values.',
+  },
   {
     key: 'tui',
     pkg: 'tui',