docs: anchor each subsystem page to its package group; make group READMEs thin tables

core.md read as a type grab-bag: LLM wire vocabulary up front, the agent/loop story buried, and no correspondence to packages/core. It now opens on the packages/core control spine — the package-by-package loop map with a Page column into session/system-prompt/tools/scope — and keeps only what the spine group declares plus the repo-wide patterns: the Agent handle with its delivery/cancellation/interception contracts, the SessionEvent envelope, branded ids, the …Map pattern. The conversation vocabulary (Message/ContentBlock, the model request, adapters — 17 type-equiv blocks) moves to llm-streaming.md, which now declares packages/llm end-to-end; the duplicate ContentBlockMap paste near its seam section folds into the moved section, and the manifest, LINK_MAP, README table rows, website label (Core data structures → Core), and inbound anchors follow.

Every packages/<group>/README pair is now a thin front door in one shape: a why-first intro (bash's seam-pattern-first paragraph rewritten as 'shell execution for the agent'), the package table, and a closing pointer to the owning docs/subsystems page — the bash-style table stays the load-bearing middle. Load-bearing trailing paragraphs relocate rather than vanish: the fs no-timeout rationale becomes a filesystem.md section (both languages), session's four sectioned tables merge into one 12-row table, examples' legacy-bin H2 collapses to a pointer at jsonrpc-demo's README, and design rationale that already lives in an Agent Note or subsystem page is now linked instead of restated. All 40 pair records re-recorded.

packages/bash/README.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 packages/bash/README.md
-README.md: 601782caad24d3555a206365a3f1954d81af1cf0
-README.zh.md: 8b96c4f80ba8776bfd8bdde178178cea946ff36c
+README.md: 7395a051742af24b96842966b71297dc01853dca
+README.zh.md: 1d5825e077c46284dbd4895e285cda8f39c252a3

packages/bash/README.md

@@ -15,3 +15,5 @@ The capability family spans the canonical executor seam, its implementations, th
 | [`tool-pwsh/`](tool-pwsh/README.md) | Exposes PowerShell execution to the model. | (registers on `ctx.tools`) |
 
 A leaf `cordis.yml` selects one executor implementation and the model-facing tools it needs. A sandboxed composition also selects a `ctx.sandbox` provider; the [ACP example](../../examples/acp-agent/) shows one complete wiring.
+
+The subsystem reference — request/spec vocabulary, results, background processes, the service, and events — is [docs/subsystems/bash.md](../../docs/subsystems/bash.md).

packages/bash/README.zh.md

@@ -15,3 +15,5 @@
 | [`tool-pwsh/`](tool-pwsh/README.md) | 向模型公开 PowerShell 执行。 | （注册到 `ctx.tools`） |
 
 叶节点 `cordis.yml` 选择一个执行器实现和所需的面向模型工具。沙箱化组合还会选择一个 `ctx.sandbox` 提供方；[ACP（Agent Client Protocol）示例](../../examples/acp-agent/)展示一套完整接线。
+
+子系统参考——请求/spec 词汇、结果、后台进程、服务与事件——见 [docs/subsystems/bash.md](../../docs/subsystems/bash.md)。