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/code-runtime/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/code-runtime/README.md
-README.md: f20a287419b94b1a9dc1d8da7303fc4d3032cfd3
-README.zh.md: f5cd4c9949f2bd7a7d6d7cd078144910712a3819
+README.md: 45dd55b8609fd33b7116f6b2ea36df3b3332e419
+README.zh.md: ebf288a49f87ad01b1ec80c3843c87c91206af26

packages/code-runtime/README.md

@@ -10,3 +10,5 @@ The code-execution capability seam (see [capability seams](../../.agents/notes/i
 | [`code-runtime-worker/`](code-runtime-worker/README.md) | Worker-thread backend | registers `ctx.codeRuntime` |
 
 Backends register the seam without changing its consumer. The child READMEs own language, isolation, and execution-budget details.
+
+The subsystem reference — run requests/results, binding namespaces, the failure taxonomy — is [docs/subsystems/code-runtime.md](../../docs/subsystems/code-runtime.md).

packages/code-runtime/README.zh.md

@@ -10,3 +10,5 @@
 | [`code-runtime-worker/`](code-runtime-worker/README.md) | Worker 线程后端 | 注册 `ctx.codeRuntime` |
 
 后端在不改变消费方的情况下注册该 seam。子 README 负责语言、隔离和执行预算细节。
+
+子系统参考——运行请求/结果、绑定命名空间、失败分类体系——见 [docs/subsystems/code-runtime.md](../../docs/subsystems/code-runtime.md)。