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.

docs/subsystems/README.zh.md

@@ -6,8 +6,8 @@
 
 | 页面 | 负责内容 |
 |---|---|
-| [core.md](core.md) | 每个轮次都在使用的主干词汇——`Message`/`ContentBlock`、`StreamChunk`、`SessionEvent`、`Agent` 句柄、`ToolDefinition`、品牌化 id，以及 `…Map → 派生联合` 模式 |
-| [llm-streaming.md](llm-streaming.md) | `StreamChunk` 协议格式（wire format）+ 适配器契约（adapter contract）、`BlockAssembler`、`LlmAdapter` seam |
+| [core.md](core.md) | `packages/core` 控制主干：逐包循环地图、`Agent` 句柄及其投递/取消/拦截契约、`SessionEvent` 信封、品牌化 id，以及 `…Map → 派生联合` 模式 |
+| [llm-streaming.md](llm-streaming.md) | `packages/llm` 的对话词汇——`Message`/`ContentBlock`、组装完成的模型请求、`StreamChunk` 协议格式（wire format）+ 适配器契约（adapter contract）、`BlockAssembler`、`LlmAdapter` seam |
 | [token-meter.md](token-meter.md) | 不可变的标量与位置回放度量，附带已消费日志修订号 |
 | [scope.md](scope.md) | 作用域注册标识、dispatch 载体，以及拥有的 `Scope` 上下文 |
 | [typert.md](typert.md) | 远程调用描述符、lookup/Context 声明、TypeRT 注册表，以及 Host Gateway/Client API seam |