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/host/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/host/README.md
-README.md: 269a27f51c842f13bc11c175916b7be22db72bd2
-README.zh.md: 559bf785eb45d59a30f676b98c14143c69d57edd
+README.md: 926cb0b6b87a8ee76cb2dab745a31f620f4e7f5c
+README.zh.md: dc617084c756b80716f9a02bd2d22ba6954030f6

packages/host/README.md

@@ -15,3 +15,5 @@ The host side of the dsh web GUI: the API gateway every client shape shares, and
 | [`directory-picker-auto/`](directory-picker-auto/README.md) | Host-adaptive picker composition | mounts a backend |
 
 `apiproxy` remains transport-independent; [`client/connection`](../client/connection/README.md) supplies the browser/HTTP carrier. Picker implementations replace one another behind the shared seam.
+
+The subsystem references: [http-server.md](../../docs/subsystems/http-server.md) and [workspace.md](../../docs/subsystems/workspace.md) (the picker seam).

packages/host/README.zh.md

@@ -15,3 +15,5 @@ dsh Web GUI 的宿主侧：所有客户端形态共享的 API 网关，以及承
 | [`directory-picker-auto/`](directory-picker-auto/README.md) | 宿主自适应选择器组合 | 挂载一个后端 |
 
 `apiproxy` 保持传输无关；[`client/connection`](../client/connection/README.md) 提供浏览器／HTTP 载体。选择器实现可在共享 seam 后互相替换。
+
+子系统参考：[http-server.md](../../docs/subsystems/http-server.md) 与 [workspace.md](../../docs/subsystems/workspace.md)（挑选 seam）。