docs(skill): document the layered registry and record the Agent Note

The skills subsystem page and dsh-skill README describe the host+per-scope
layers, SkillViewOptions joins the type-equiv corpus and the cordis-catalog
type pages, generated catalogs pick up the shifted source refs, and the
architecture Agent Note records the decision, the nearest-layer-wins
precedence choice, and the rejected alternatives.

packages/skill/skill/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/skill/skill/README.md
-README.md: 3dc2bcfa5775736717bdebcb92329d5655198234
-README.zh.md: e57e389f9080cfc763916111cf80ea97980f01e7
+README.md: 9c27a271f03f33d2b53984a6a5c18082ccc6169a
+README.zh.md: 085dec3e342c2f42a39d28b995dcb4e2cf38f440

packages/skill/skill/README.md

@@ -6,15 +6,17 @@ Pure agent skill provider registry.
 
 This package owns the `ctx.skills` interface. It does not know whether skills come from local files, embedded plugin data, HTTP, or another backend; providers register those sources with `ctx.skills.registerProvider(...)`. The shipped local implementation is [`@deepseek-ai/dsh-skill-local`](../skill-local).
 
+The registry is host+per-scope layered over [`@deepseek-ai/dsh-scope`](../../core/scope), the shape the tools registry established: a registration files into the layer of its calling context's scope — host rows and repository plugins land in the global layer, a plugin mounted by an agent preset's standing composition lands in that preset's layer — and a read merges the global layer with the viewing scope's chain, the nearest layer winning a duplicate name outright while rank decides duplicates only within one layer.
+
 ## Service: `SkillService` (ctx key: `skills`)
 
 ### Public API
 
-- `ctx.skills.registerProvider(create): () => void` Calls a synchronous provider factory with `{ signal, invalidate }`, then registers its readonly result by unique `provider.name`. Duplicate names throw, `runtime` is reserved, and failed registration aborts the signal. The exact Cordis disposer unregisters the provider, aborts the signal, and preserves ordered composite teardown.
-- `ctx.skills.snapshot({ cwd?, signal? })` Returns the invocation-neutral `{ skills, complete }` observation. `complete` is false when any provider rejects or explicitly reports incomplete discovery, or when a second catalog revision races the bounded retry; candidates supplied by that observation remain in this result, which is never cached.
-- `ctx.skills.list({ cwd?, signal? })` Borrows the readonly lookup options, then returns every winning summary for the current workspace, merged across providers and sorted by name. Consumers apply `isModelInvocable(skill)` or `isUserInvocable(skill)` at their own boundary.
-- `ctx.skills.get(name, { cwd?, signal? })` Uses the same readonly options and winning candidate for discovery and loading, rechecks cancellation after discovery or a cache hit, races provider loading against the signal, validates the loaded definition, then returns it regardless of invocation policy.
-- `ctx.skills.register(skill): () => void` Registers a readonly runtime embedded skill, adding the all-invocable policy and `provider: "runtime"` when omitted. Same-name runtime registrations are first-wins: a duplicate logs a warning and gets a no-op disposer. Successful registrations return the exact Cordis disposer for ordered composite teardown.
+- `ctx.skills.registerProvider(create): () => void` Calls a synchronous provider factory with `{ signal, invalidate }`, then registers its readonly result by `provider.name`, unique within the calling context's layer. Duplicate names in one layer throw, `runtime` is reserved, and failed registration aborts the signal. The exact Cordis disposer unregisters the provider, aborts the signal, and preserves ordered composite teardown.
+- `ctx.skills.snapshot({ cwd?, signal?, scope? })` Returns the invocation-neutral `{ skills, complete }` observation for the viewing scope's merged layers. `complete` is false when any provider rejects or explicitly reports incomplete discovery, or when a second catalog revision races the bounded retry; candidates supplied by that observation remain in this result, which is never cached.
+- `ctx.skills.list({ cwd?, signal?, scope? })` Borrows the readonly view options, then returns every winning summary for the current workspace, merged across the global layer and the viewing scope's chain and sorted by name. Consumers apply `isModelInvocable(skill)` or `isUserInvocable(skill)` at their own boundary.
+- `ctx.skills.get(name, { cwd?, signal?, scope? })` Uses the same readonly options and winning candidate for discovery and loading, rechecks cancellation after discovery or a cache hit, races provider loading against the signal, validates the loaded definition, then returns it regardless of invocation policy.
+- `ctx.skills.register(skill): () => void` Registers a readonly runtime embedded skill into the calling context's layer, adding the all-invocable policy and `provider: "runtime"` when omitted. Same-name runtime registrations in one layer are first-wins: a duplicate logs a warning and gets a no-op disposer. Successful registrations return the exact Cordis disposer for ordered composite teardown.
 
 ### Events
 
@@ -49,7 +51,7 @@ A provider factory runs synchronously and receives one registration-scoped contr
 
 The registry validates candidates before caching and definitions before returning them. The winning provider receives the same candidate and opaque `locator` it returned from `list()`, allowing backend-specific file, URL, id, or version handles. Callers and providers must preserve the readonly contract.
 
-Contract violations fail fast. A rejected provider `list()` is treated as a transient source failure and omitted. An explicit incomplete observation still contributes its candidates for `list()` and `get()`, but makes the aggregate snapshot incomplete and uncacheable. A provider or runtime revision change discards an in-flight result and retries once. If the retry is also superseded, its candidates are returned incomplete and uncached so a continuously invalidating provider cannot monopolize the caller. Duplicate names resolve by rank, provider registration order, then provider-local order. Summaries are sorted by skill name.
+Contract violations fail fast. A rejected provider `list()` is treated as a transient source failure and omitted. An explicit incomplete observation still contributes its candidates for `list()` and `get()`, but makes the aggregate snapshot incomplete and uncacheable. A provider or runtime revision change discards an in-flight result and retries once. If the retry is also superseded, its candidates are returned incomplete and uncached so a continuously invalidating provider cannot monopolize the caller. Within one layer, duplicate names resolve by rank, provider registration order, then provider-local order; across layers the nearest scope's entry wins the name. Summaries are sorted by skill name.
 
 Definitions remain progressively loaded. `get()` asks the winning provider for the body on every call rather than caching it in this registry. If the returned definition has a different name from the selected candidate, the stale selection is rejected and the registry internally invalidates that exact provider so the next snapshot rediscovers its catalog.
 
@@ -74,4 +76,4 @@ No direct prompt effect. The named consumer owns the durable initial catalog and
 - **Invalidation is provider-driven** — the registry has no TTL and cannot infer that an arbitrary remote source changed; each mutable provider must retain and call its registration-scoped `invalidate()` capability from its own observation mechanism.
 - **Providers are queried sequentially** — one slow cooperative provider delays every provider registered after it; cancellation stops the caller's wait but cannot terminate work an uncooperative provider keeps running.
 - **Incomplete observations are not retained** — rejected providers are omitted and explicitly supplied candidates remain available only to the current lookup; the registry owns neither a last-good catalog nor per-provider diagnostics.
-- **Duplicate resolution is first-wins** — later lower-priority candidates are logged and hidden; there is no API to inspect all shadowed definitions.
+- **Duplicate resolution is first-wins** — later lower-priority candidates within a layer are logged and hidden, and a nearer layer shadows a farther one silently; there is no API to inspect all shadowed definitions.

packages/skill/skill/README.zh.md

@@ -6,15 +6,17 @@
 
 该包负责 `ctx.skills` 接口。它不知道 skill 来自本地文件、嵌入式插件数据、HTTP 还是其他后端；提供方通过 `ctx.skills.registerProvider(...)` 注册这些来源。已发布的本地实现是 [`@deepseek-ai/dsh-skill-local`](../skill-local)。
 
+注册表基于 [`@deepseek-ai/dsh-scope`](../../core/scope) 采用宿主 + 按 scope 的分层结构，即工具注册表确立的形态：注册落入调用方上下文 scope 对应的层——宿主行与 repository 插件落入全局层，由 agent preset 常驻组合挂载的插件落入该 preset 的层——读取时将全局层与观察 scope 的链合并，最近层直接赢得重名，rank 只在单层内裁决重名。
+
 ## 服务：`SkillService`（ctx 键：`skills`）
 
 ### 公开 API
 
-- `ctx.skills.registerProvider(create): () => void` 调用同步提供方工厂并向其传入 `{ signal, invalidate }`，随后使用唯一 `provider.name` 注册其只读结果。重复提供方名称会抛错，`runtime` 为保留名称；注册失败会中止信号。精确的 Cordis disposer 会注销提供方、中止信号，并保持有序组合拆卸。
-- `ctx.skills.snapshot({ cwd?, signal? })` 返回与调用策略无关的 `{ skills, complete }` 观测。任一提供方调用被拒绝或显式报告发现不完整，或有界重试期间又发生目录修订时，`complete` 为 false；该次观测提供的候选项仍保留在此结果中，但该结果绝不缓存。
-- `ctx.skills.list({ cwd?, signal? })` 借用只读查找选项，然后返回当前工作区中的全部胜出摘要；这些摘要跨提供方合并，并按名称排序。消费方在自身边界调用 `isModelInvocable(skill)` 或 `isUserInvocable(skill)`。
-- `ctx.skills.get(name, { cwd?, signal? })` 在发现和加载中使用同一组只读选项和胜出候选项；在发现或缓存命中后重新检查取消，让提供方加载与信号竞速，验证已加载定义，然后无论调用策略如何都将其返回。
-- `ctx.skills.register(skill): () => void` 注册只读运行时嵌入式 skill，省略时添加允许模型和用户调用的策略以及 `provider: "runtime"`。同名运行时注册使用先到先得：重复项会记录警告，并获得无操作 disposer。成功注册会返回精确的 Cordis disposer，以供有序组合拆卸。
+- `ctx.skills.registerProvider(create): () => void` 调用同步提供方工厂并向其传入 `{ signal, invalidate }`，随后以在调用方上下文所在层内唯一的 `provider.name` 注册其只读结果。同层重复提供方名称会抛错，`runtime` 为保留名称；注册失败会中止信号。精确的 Cordis disposer 会注销提供方、中止信号，并保持有序组合拆卸。
+- `ctx.skills.snapshot({ cwd?, signal?, scope? })` 返回观察 scope 各层合并后、与调用策略无关的 `{ skills, complete }` 观测。任一提供方调用被拒绝或显式报告发现不完整，或有界重试期间又发生目录修订时，`complete` 为 false；该次观测提供的候选项仍保留在此结果中，但该结果绝不缓存。
+- `ctx.skills.list({ cwd?, signal?, scope? })` 借用只读视图选项，然后返回当前工作区中的全部胜出摘要；这些摘要在全局层与观察 scope 链之间合并，并按名称排序。消费方在自身边界调用 `isModelInvocable(skill)` 或 `isUserInvocable(skill)`。
+- `ctx.skills.get(name, { cwd?, signal?, scope? })` 在发现和加载中使用同一组只读选项和胜出候选项；在发现或缓存命中后重新检查取消，让提供方加载与信号竞速，验证已加载定义，然后无论调用策略如何都将其返回。
+- `ctx.skills.register(skill): () => void` 将只读运行时嵌入式 skill 注册进调用方上下文所在层，省略时添加允许模型和用户调用的策略以及 `provider: "runtime"`。同层同名运行时注册使用先到先得：重复项会记录警告，并获得无操作 disposer。成功注册会返回精确的 Cordis disposer，以供有序组合拆卸。
 
 ### 事件
 
@@ -49,7 +51,7 @@
 
 注册表在缓存前验证候选项，在返回前验证定义。胜出提供方会收到同一候选项和不透明 `locator`，两者都是它从 `list()` 返回的内容，从而支持后端专用文件、URL、id 或版本句柄。调用方和提供方必须保持只读约定。
 
-违反约定时会快速失败。`list()` 返回的 Promise 被拒绝会被视为瞬时来源失败，并省略其结果。显式的不完整观测仍会为 `list()` 和 `get()` 提供其候选项，但会使聚合快照不完整且不可缓存。提供方或运行时修订发生变化时，会丢弃正在进行的结果并重试一次。如果这次重试也被后续修订取代，则返回其候选项，并将结果标为不完整且不予缓存，以免持续触发失效的提供方一直占用调用方。重复名称依次按 rank、提供方注册顺序和提供方本地顺序解决冲突。摘要按 skill 名称排序。
+违反约定时会快速失败。`list()` 返回的 Promise 被拒绝会被视为瞬时来源失败，并省略其结果。显式的不完整观测仍会为 `list()` 和 `get()` 提供其候选项，但会使聚合快照不完整且不可缓存。提供方或运行时修订发生变化时，会丢弃正在进行的结果并重试一次。如果这次重试也被后续修订取代，则返回其候选项，并将结果标为不完整且不予缓存，以免持续触发失效的提供方一直占用调用方。单层内重复名称依次按 rank、提供方注册顺序和提供方本地顺序解决冲突；跨层则由最近 scope 的条目赢得名称。摘要按 skill 名称排序。
 
 定义仍采用渐进式加载。`get()` 每次调用都会向胜出提供方请求正文，而不是在此注册表中缓存正文。若返回定义的名称不同于所选候选项，系统会拒绝该陈旧选择，并由注册表在内部使该精确提供方失效，以便下一次快照重新发现其目录。
 
@@ -74,4 +76,4 @@
 - **失效由提供方驱动**：注册表没有 TTL，无法推断任意远程来源是否已发生变化；每个可变提供方都必须保留其注册作用域内的 `invalidate()` 能力，并由自身的观测机制调用它。
 - **提供方依次查询**：一个响应取消但速度缓慢的提供方会延迟之后注册的所有提供方；取消会停止调用方等待，但无法终止不响应取消的提供方持续运行的工作。
 - **不保留不完整观测**：被拒绝的提供方会被省略，显式提供的候选项也仅在当前查找中可用；注册表既不负责上一份可用目录，也不负责逐提供方诊断。
-- **重复解析使用先到先得**：系统会记录并隐藏较晚出现的低优先级候选项；不提供检查全部被遮蔽定义的 API。
+- **重复解析使用先到先得**：系统会记录并隐藏层内较晚出现的低优先级候选项，较近的层会静默遮蔽较远的层；不提供检查全部被遮蔽定义的 API。