feat(client): increment forked session titles

packages/client/test-runtime/src/sessions.ts

@@ -395,10 +395,10 @@ export class TestSessions implements ISessions {
   /**
    * Recorded fork stub: no child materializes (benches asserting the full
    * fork flow drive the production service; this face only proves the call).
-   * @param opts - source session id and optional cut anchor.
+   * @param opts - source session id, optional cut anchor, and client title policy.
    * @returns the source id (no child record is created).
    */
-  fork(opts: { sessionId: SessionId; atSeq?: number }): Promise<SessionId> {
+  fork(opts: { sessionId: SessionId; atSeq?: number; increaseTitle?: boolean }): Promise<SessionId> {
     this.calls.push({ method: 'fork', args: [opts] })
     return Promise.resolve(opts.sessionId)
   }

packages/client/test-runtime/tests/runtime.spec.tsx

@@ -211,11 +211,13 @@ describe('sessions', () => {
     runtime.sessions.clear()
     await runtime.flush()
     expect(runtime.sessions.list.getSnapshot().current).toBeUndefined()
-    await expect(runtime.sessions.fork({ sessionId: 's1' as SessionId, atSeq: 7 })).resolves.toBe('s1')
+    await expect(runtime.sessions.fork({
+      sessionId: 's1' as SessionId, atSeq: 7, increaseTitle: true,
+    })).resolves.toBe('s1')
     expect(runtime.sessions.calls).toEqual([
       { method: 'open', args: ['s1'] },
       { method: 'clear', args: [] },
-      { method: 'fork', args: [{ sessionId: 's1', atSeq: 7 }] },
+      { method: 'fork', args: [{ sessionId: 's1', atSeq: 7, increaseTitle: true }] },
     ])
     await runtime.dispose()
   })