Merge branch 'worktree-llm-dynamic-config' into worktree-llm-web-config

# Conflicts:
#	docs/cordis-catalog/services.md
#	docs/core-data-structures/core.i18n.yaml
#	docs/event-producer-consumer.md
#	examples/headless-agent/tests/headless.snapshot.ts
#	examples/headless-agent/tests/snapshots/missing-credential/stream-json.expected.jsonl
#	packages/llm/llm-deepseek/README.i18n.yaml
#	packages/llm/llm-deepseek/src/index.ts
#	packages/llm/llm-pi-ai/README.i18n.yaml
#	packages/llm/llm-pi-ai/src/index.ts
#	packages/llm/llm/README.i18n.yaml
#	packages/llm/llm/src/index.ts

docs/core-data-structures/core.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 docs/core-data-structures/core.md
-core.md: 8a052f30b340e3f352b2b186fe646629e215b8c0
-core.zh.md: 2c808448138f08c8bbf4bc63c60ee69e6537d5b1
+core.md: 6e52ca14634ea622444b5df7ea2780912ac03d24
+core.zh.md: cbe2ba24a80fa22873697a40c3a7a9b4b71dd3e7

docs/core-data-structures/core.md

@@ -183,6 +183,30 @@ Source: [`packages/llm/llm/src/types.ts`](../../packages/llm/llm/src/types.ts)
 
 Provider and model discovery uses small provider-neutral descriptors. A model catalog is advisory: routing still keys on a registered provider, and an adapter may accept unlisted model ids.
 
+Registering an adapter returns a handle: the disposer, plus the atomic route replacement a plugin whose route set is user-configurable needs.
+
+```ts type-equiv
+/**
+ * What {@link LlmService.registerAdapter} returns: the disposer, plus an
+ * atomic route replacement for the same adapter instance.
+ */
+interface AdapterRegistrationHandle {
+  /** Release every route this registration currently holds. */
+  (): void
+  /**
+   * Replace this registration's routes with `providers`, keeping the same
+   * adapter instance. The candidate set is validated in full first — a
+   * conflict with another adapter, an invalid name, or bad provider metadata
+   * throws and leaves the current routes untouched — and the swap itself is
+   * one synchronous section, so no request can observe a gap. An empty array
+   * is legal here (a settings section that emptied holds zero routes while
+   * staying registered), unlike an empty initial registration.
+   * @param providers - the complete next route set for this registration.
+   */
+  replace(providers: string[]): void
+}
+```
+
 ```ts type-equiv
 /** Display metadata for one registered provider route. */
 interface LlmProviderInfo {

docs/core-data-structures/core.zh.md

@@ -189,6 +189,30 @@ interface MessageSourceMap {
 
 提供方与模型发现使用小型、提供方无关的描述符。模型目录仅供参考：路由仍以已注册提供方为键，适配器也可以接受未列出的模型 id。
 
+注册适配器会返回一个句柄：既是释放器，也带有原子的路由替换——路由集合由用户配置决定的插件正需要它。
+
+```ts type-equiv
+/**
+ * What {@link LlmService.registerAdapter} returns: the disposer, plus an
+ * atomic route replacement for the same adapter instance.
+ */
+interface AdapterRegistrationHandle {
+  /** Release every route this registration currently holds. */
+  (): void
+  /**
+   * Replace this registration's routes with `providers`, keeping the same
+   * adapter instance. The candidate set is validated in full first — a
+   * conflict with another adapter, an invalid name, or bad provider metadata
+   * throws and leaves the current routes untouched — and the swap itself is
+   * one synchronous section, so no request can observe a gap. An empty array
+   * is legal here (a settings section that emptied holds zero routes while
+   * staying registered), unlike an empty initial registration.
+   * @param providers - the complete next route set for this registration.
+   */
+  replace(providers: string[]): void
+}
+```
+
 ```ts type-equiv
 /** Display metadata for one registered provider route. */
 interface LlmProviderInfo {