docs(subsystems): open core.md on agent creation/ownership and the Agent contract; enforce a complete folder index

core.md claimed to be the packages/core reference but opened on repo-wide type patterns and never documented the ownership vocabulary: AgentHandle, CreateAgentOptions, ResumeAgentOptions, and AgentFactory were TYPE_LINK_EXEMPTIONS pointing at a package README, invisible to the folder that calls itself the type reference. The page now reads spine map -> creation and ownership (AgentHandle pasted; the options and factory summarized with links into the generated registry section) -> the Agent handle (AgentStatus, AgentOptions, SteeringOutcome, SteeringReceipt, and SettleReason now pasted; the one settlement prose wall split by topic; delivery vocabulary ordered as a message travels) -> initiator -> interception -> a Sessions summary -> the ToolDefinition pointer -> an explicitly framed repo-wide patterns tail (the ...Map pattern, branded ids). The duplicate SessionEvent paste is gone -- session.md owns it and LINK_MAP follows -- the four ownership types moved from TYPE_LINK_EXEMPTIONS into LINK_MAP -> core.md, and three dead LINK_MAP entries (ContinuationDecision, ContinuationStop, HookContext) no longer name types absent from the source tree. The "what this page owns" meta-section folds into the intro.

The subsystems README index silently lost tasks.md and session-reference.md on both language sides during a base absorption; the rows are restored and scripts/project-doc-site.spec.ts now fails when any page misses either side of the index (proven red on a removed row). tools.md links ToolSchema to its llm-streaming.md declaration instead of calling it core; subagent.md links AgentHandle and CreateAgentOptions.seed to the new section. A new Agent Note records the package-anchored page-scoping decision; the 2026-06-20 catalog note marks its spine-vs-seam rule superseded as the page-scoping rule while keeping the type-equiv mechanism current, and docs/AGENTS.md cites the new note.
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Tianyi Cui
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# Agent Note: Package-anchored subsystem pages and thin group READMEs
Status: implemented
English | [中文](2026-08-03-package-anchored-subsystem-pages.zh.md)
## Problem
The [subsystems catalog](2026-06-20-core-data-structures-catalog.md) scoped its front page by the spine-vs-seam rule: a type was "core" if the loop holds, derives, streams, or logs it on every turn. That rule selected types, not packages, so as the folder grew to forty-plus pages the front page became a cross-package grab-bag: LLM conversation vocabulary sat above the agent contracts, the creation/ownership vocabulary (`AgentHandle`, `CreateAgentOptions`, `ResumeAgentOptions`, `AgentFactory`) was documented nowhere in the folder because the generator exempted it to a package README, and a reader could not predict which page documents a type from where the type lives. Package-group READMEs meanwhile had no common shape — some carried sectioned tables, stray design essays, or trailing paragraphs that belonged on a subsystem page.
## Decision
Every `docs/subsystems/` page anchors to the package or package group that declares its vocabulary, and page membership follows the repository layout: [core.md](../../../../docs/subsystems/core.md) is the `packages/core` page (creation and ownership, the `Agent` handle with its delivery/cancellation/interception contracts, pointers to the group's dedicated pages), [llm-streaming.md](../../../../docs/subsystems/llm-streaming.md) owns `packages/llm` end-to-end, and so on. Repo-wide type patterns (`…Map → derived-union`, branded ids) stay on core.md in an explicitly framed closing section rather than interleaved with the package content. This supersedes the spine-vs-seam rule *as the page-scoping rule*; the placement heuristic that survives is simpler: a type is documented where its declaring package's page is, and machinery keeps living with its machinery.
Every type a generated signature references must resolve somewhere in the folder: the agent ownership vocabulary moved from the generator's `TYPE_LINK_EXEMPTIONS` into `LINK_MAP → core.md`, so exemptions are reserved for genuinely service-local or vendored shapes. Each pasted declaration has one home (`SessionEvent` lives on [session.md](../../../../docs/subsystems/session.md); core.md summarizes and links).
Every `packages/<group>/README.md` pair is a thin front door in one shape: a why-first intro paragraph, a package table (Package / Role / ctx key), and a closing pointer to the owning subsystems page. Load-bearing prose that outgrows that shape relocates to the owning subsystems page rather than being deleted.
The [subsystems README](../../../../docs/subsystems/README.md) indexes every page in the folder on both language sides; `scripts/project-doc-site.spec.ts` enforces one table row per page, so a page added by a later PR (or absorbed in a merge) cannot silently miss the index.
## Alternatives considered
**Keep the spine-vs-seam scoping rule.** It answered "is this type core?" per type, which is why the front page accumulated types from four packages while missing half of `packages/core/agent`'s public surface. Predictability by repository layout won.
**A flat single-document catalog.** Already rejected in the [original catalog note](2026-06-20-core-data-structures-catalog.md); the growth to forty-one pages confirmed that verdict.
**Document ownership vocabulary only in package READMEs (the exemption status quo).** This left `AgentHandle` and the create/resume options invisible to the folder that claims to be the type reference, and the generated `Types:` footers could not link them.
## Consequences
- Which page documents a type is predictable from `packages/<group>/`; the subsystems README is a complete index enforced by test.
- Generated signature footers link the agent ownership vocabulary instead of silently exempting it.
- `verify-type-equiv`'s 1:1 manifest keeps each paste single-homed; the duplicate `SessionEvent` paste is gone.
- The [original catalog note](2026-06-20-core-data-structures-catalog.md) remains the owner of the `ts type-equiv` drift-gate mechanism; only its page-scoping rule is superseded here.