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/client/README.zh.md

@@ -38,3 +38,5 @@ dsh web GUI 的浏览器侧：shell 启动、浏览器与宿主通信、共享 U
 | [`ui-models/`](ui-models/README.md) | 提供模型提供方配置与 DeepSeek 配置引导。 |
 
 每个子文档负责自身的契约和详细行为。[slot 系统标准](../../.agents/notes/implemented/architecture/2026-07-22-slot-type-chain-implementation.md)与 [Web 客户端架构 Agent Note](../../.agents/notes/implemented/architecture/2026-07-19-gui-web-client-architecture.md)负责跨包组合与加载决策。
+
+子系统参考是 [client-modules.md](../../docs/subsystems/client-modules.md)；[slot 系统标准](../../.agents/notes/implemented/architecture/2026-07-22-slot-type-chain-implementation.md)是权威 slot 模型，[web 客户端架构说明](../../.agents/notes/implemented/architecture/2026-07-19-gui-web-client-architecture.md)拥有加载链与对象层。