feat(session-title): user rename pins the title against automatic generation

sessionTitle.rename appends a user-source session/title event; onUserMessage
skips scheduling while a user title stands, and an explicit refresh is the
deliberate unpin (provider regeneration, or a re-derived fallback when no
provider is registered).

docs/config-catalog.md

@@ -1203,7 +1203,7 @@ export interface Config {
 }
 ```
 
-Source: [`packages/session-title/session-title/src/index.ts:75`](../packages/session-title/session-title/src/index.ts)
+Source: [`packages/session-title/session-title/src/index.ts:79`](../packages/session-title/session-title/src/index.ts)
 
 ## `@deepseek-ai/dsh-session-title-all-messages-llm`
 

docs/cordis-catalog/services.md

@@ -1604,6 +1604,18 @@ Log-backed title fold plus asynchronous fallback generation.
  */
 get(session: Session): SessionTitleSnapshot | undefined
 
+/**
+ * Accept an explicit user title. Appends a `session/title` event with the
+ * `user` source, which pins the title: in-flight automatic generation is
+ * superseded and later user messages schedule none (an explicit
+ * {@link SessionTitleService.refresh} remains the deliberate unpin).
+ * @param session - exact live session to rename.
+ * @param title - raw user input; normalized before acceptance.
+ * @returns the accepted title snapshot.
+ * @throws {Error} when the session is not live or the title normalizes to empty.
+ */
+rename(session: Session, title: string): SessionTitleSnapshot
+
 /**
  * Explicitly retry the registered provider, or materialize the built-in
  * fallback when no provider is registered.
@@ -1624,7 +1636,7 @@ register(provider: SessionTitleProvider): () => Promise<void>
 
 Types: [Session](../core-data-structures/session.md) · [SessionTitleProvider](../core-data-structures/session-title.md) · [SessionTitleSnapshot](../core-data-structures/session-title.md)
 
-Source: [`packages/session-title/session-title/src/index.ts:240`](../../packages/session-title/session-title/src/index.ts)
+Source: [`packages/session-title/session-title/src/index.ts:244`](../../packages/session-title/session-title/src/index.ts)
 
 ## `ctx.skills` — `SkillService`
 

docs/core-data-structures/session-title.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/session-title.md
-session-title.md: 33efc911c0ca1ae94dc4ded74676e5c32a73bdd5
-session-title.zh.md: a4b95a726d2bc89a13d14f1daa2f825cd5aa91b1
+session-title.md: 0857f5255be616d00ea1f49fdfd97cffda1fd4b2
+session-title.zh.md: 75fa42bfbdec18afc20ca59e2c02631e01cfd994

docs/core-data-structures/session-title.md

@@ -34,6 +34,10 @@ type SessionTitleSource =
     readonly provider: SessionTitleProviderId
     readonly model?: SessionTitleModelProvenance
   }
+  | {
+    /** Explicit user rename: pins the title — automatic generation stops scheduling. */
+    readonly kind: 'user'
+  }
 ```
 
 ```ts type-equiv

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

@@ -34,6 +34,10 @@ type SessionTitleSource =
     readonly provider: SessionTitleProviderId
     readonly model?: SessionTitleModelProvenance
   }
+  | {
+    /** Explicit user rename: pins the title — automatic generation stops scheduling. */
+    readonly kind: 'user'
+  }
 ```
 
 ```ts type-equiv

docs/persistence-catalog.md

@@ -412,7 +412,7 @@ Source: [`packages/sandbox/sandbox-policy/src/session-mode.ts:33`](../packages/s
 
 Types: [SessionTitleEventData](core-data-structures/session-title.md)
 
-Source: [`packages/session-title/session-title/src/index.ts:96`](../packages/session-title/session-title/src/index.ts)
+Source: [`packages/session-title/session-title/src/index.ts:100`](../packages/session-title/session-title/src/index.ts)
 
 #### `session/title-llm-request` — log-only