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/guard/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/guard/README.md
-README.md: 5791474a2fd6aeda728d4c335c930069ade6e023
-README.zh.md: 82d779d2f1834317672b8fb03f2a4a875bb566fc
+README.md: f0a80b1f497ee5b2459bebb55f886b42d74e4323
+README.zh.md: c7747e2febcb1656925fd556743eb2dd28090e37

packages/guard/README.md

@@ -8,3 +8,5 @@ Behavioral guard plugins watch the agent loop for unproductive patterns and enfo
 |---|---|---|
 | [`repeat-tool-guard/`](repeat-tool-guard/README.md) | Advisory reminders for repeated tool calls | listens on tool and agent events |
 | [`timeout-policy/`](timeout-policy/README.md) | Arms per-call tool deadlines as deployment policy | registers a `tools/execute` listener |
+
+Reminders travel as `additionalContexts` on the `tools/post-execute` decision and are appended as logged plugin-sourced `user/message` events ([tools](../../docs/subsystems/tools.md)); the timeout split across `dsh-timeout`, capability termination, and this policy layer is recorded in the [timeout-library Agent Note](../../.agents/notes/implemented/architecture/2026-07-06-timeout-deadline-library.md).

packages/guard/README.zh.md

@@ -8,3 +8,5 @@
 |---|---|---|
 | [`repeat-tool-guard/`](repeat-tool-guard/README.md) | 针对重复工具调用的建议性提醒 | 监听工具和 agent 事件 |
 | [`timeout-policy/`](timeout-policy/README.md) | 以部署策略形式设置单次工具调用截止时间 | 注册 `tools/execute` 监听器 |
+
+提醒作为 `additionalContexts` 随 `tools/post-execute` 决策传递，并以插件来源的 `user/message` 事件记录（[工具](../../docs/subsystems/tools.md)）；跨 `dsh-timeout`、能力方终止与本策略层的超时拆分记录在[超时库 Agent Note](../../.agents/notes/implemented/architecture/2026-07-06-timeout-deadline-library.md)。