Merge remote-tracking branch 'origin/worktree/web-multimodal-image-input' into worktree/pr555-simplify

# Conflicts:
#	.agents/notes/implemented/feature/2026-07-22-web-multimodal-image-input-and-durable-attachments.i18n.yaml
#	apps/web/tests/image-display.snapshot.ts
#	docs/core-data-structures/core.i18n.yaml
#	packages/client/ui-trajectory/tests/client-bundle.spec.ts

docs/core-data-structures/core.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 docs/core-data-structures/core.md
-core.md: e68c5de7430cceede68b76d3ac322872105b0a1f
-core.zh.md: 030f0fb26407dcfb1a451493d27196b234bbf202
+core.md: b1fd258ba1dedc7f2b7cbe57b2f78b01329ed4e5
+core.zh.md: 0a18b19415bee610187a1a7ffd6905cf12dbfcb5

docs/core-data-structures/core.md

@@ -481,7 +481,10 @@ type AgentCancelCause =
 `Agent` is an interface over the public live-agent contract. Concrete drivers own the `followup`/`steer`/`inject` aliases and route them through `send`'s (`target` × `wakeup`) matrix.
 
 ```ts type-equiv
-/** Public live-agent handle with aliases over the unified delivery primitive. */
+/**
+ * Public live-agent handle with aliases over the unified delivery primitive.
+ * @typert object
+ */
 interface Agent {
   /** The single identity shared with {@link session}. */
   readonly id: SessionId

docs/core-data-structures/core.zh.md

@@ -489,7 +489,10 @@ type AgentCancelCause =
 `Agent` 是覆盖公开活跃 agent 契约的接口。具体驱动器拥有 `followup`/`steer`/`inject` 别名方法，并将它们经由 `send` 的（`target` × `wakeup`）矩阵路由。
 
 ```ts type-equiv
-/** Public live-agent handle with aliases over the unified delivery primitive. */
+/**
+ * Public live-agent handle with aliases over the unified delivery primitive.
+ * @typert object
+ */
 interface Agent {
   /** The single identity shared with {@link session}. */
   readonly id: SessionId

docs/core-data-structures/session.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 docs/core-data-structures/session.md
-session.md: 6ae0ab79b5c7bc3bc1859bf819ce25679672a7f0
-session.zh.md: 79ed40f7eee7a8cae05a366d646f85580c73d5d2
+session.md: fd8285eebd76e8bd7723ee86ae15427f4923f4d6
+session.zh.md: 1033bfda117b5693421f0bdf4ec3fc136039f223

docs/core-data-structures/session.md

@@ -302,6 +302,7 @@ The body-stripped declaration keeps the plain class's public constructor, state
  *
  * Plain class (not a Service) — create instances via `ctx.sessions.create()`.
  * Seeding with an existing event log replays/forks a session.
+ * @typert object
  */
 declare class Session {
   /** The ordered surface over this session's event log. */

docs/core-data-structures/session.zh.md

@@ -304,6 +304,7 @@ interface SurfaceFoldResult {
  *
  * Plain class (not a Service) — create instances via `ctx.sessions.create()`.
  * Seeding with an existing event log replays/forks a session.
+ * @typert object
  */
 declare class Session {
   /** The ordered surface over this session's event log. */