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/interaction/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/interaction/README.md
-README.md: 506b47753fc9250f9f7bd971265421ad46a106b2
-README.zh.md: 34d336f3d3c10deab166d5c13bb86c13ee9bced0
+README.md: 31a306cb08fe69297b0d0843b57b5e491c0bbe44
+README.zh.md: 6eafe8726ba59edd3a6bf739deacc037a9b56b76

packages/interaction/README.md

@@ -13,3 +13,5 @@ The seams through which a human collaborates with a running agent — questions,
 | [`tool-ask-user/`](tool-ask-user/README.md) | Exposes human questions to the model. | (registers on `ctx.tools`) |
 
 These packages integrate through existing agent and session contracts rather than changing the loop. Interactive applications provide the concrete command, approval, and question adapters; automation uses [`acp/`](../acp/README.md), and runnable demo bundles live under [`examples/`](../examples/README.md). The product [`dsh`](../../apps/cli/README.md) CLI composes these packages directly.
+
+The subsystem references: [approval.md](../../docs/subsystems/approval.md), [permission.md](../../docs/subsystems/permission.md), [user-interaction.md](../../docs/subsystems/user-interaction.md), [commands.md](../../docs/subsystems/commands.md), and [tui.md](../../docs/subsystems/tui.md). The automation-only ACP transport is [`acp/`](../acp/README.md), the SDK's JSON-RPC server half [`scaffold/server`](../scaffold/README.md), and the shared bin boot glue [`boot/`](../boot/README.md).

packages/interaction/README.zh.md

@@ -13,3 +13,5 @@
 | [`tool-ask-user/`](tool-ask-user/README.md) | 向模型公开用户问题。 | （注册到 `ctx.tools`） |
 
 这些包通过现有的 agent（智能体）和会话契约集成，而不改变循环。交互式应用提供具体的命令、审批和提问适配器；自动化使用 [`acp/`](../acp/README.md)，可运行的演示组合包位于 [`examples/`](../examples/README.md)。产品 [`dsh`](../../apps/cli/README.md) CLI（命令行界面）直接组合这些包。
+
+子系统参考：[approval.md](../../docs/subsystems/approval.md)、[permission.md](../../docs/subsystems/permission.md)、[user-interaction.md](../../docs/subsystems/user-interaction.md)、[commands.md](../../docs/subsystems/commands.md) 与 [tui.md](../../docs/subsystems/tui.md)。仅自动化的 ACP 传输在 [`acp/`](../acp/README.md)，SDK 的 JSON-RPC 服务器一半在 [`scaffold/server`](../scaffold/README.md)，共享 bin 启动胶水在 [`boot/`](../boot/README.md)。