fix(tui): keep /title session names in sync

Route TUI /title through session.title RPC and queue titles when the session DB row is still initializing, so renamed sessions reliably appear in /resume and browse flows.

ui-tui/src/__tests__/createSlashHandler.test.ts

@@ -397,6 +397,34 @@ describe('createSlashHandler', () => {
     expect(rpc).not.toHaveBeenCalled()
     expect(ctx.transcript.sys).toHaveBeenCalledWith('no active session — nothing to save')
   })
+
+  it('/title <name> uses session.title RPC and bypasses slash.exec', async () => {
+    patchUiState({ sid: 'sid-abc' })
+    const rpc = vi.fn(() => Promise.resolve({ pending: false, title: 'my title' }))
+    const ctx = buildCtx({ gateway: { ...buildGateway(), rpc } })
+
+    createSlashHandler(ctx)('/title my title')
+
+    expect(rpc).toHaveBeenCalledWith('session.title', { session_id: 'sid-abc', title: 'my title' })
+    expect(ctx.gateway.gw.request).not.toHaveBeenCalled()
+    await vi.waitFor(() => {
+      expect(ctx.transcript.sys).toHaveBeenCalledWith('session title set: my title')
+    })
+  })
+
+  it('/title with no args fetches and displays the current title', async () => {
+    patchUiState({ sid: 'sid-abc' })
+    const rpc = vi.fn(() => Promise.resolve({ title: 'demo title' }))
+    const ctx = buildCtx({ gateway: { ...buildGateway(), rpc } })
+
+    createSlashHandler(ctx)('/title')
+
+    expect(rpc).toHaveBeenCalledWith('session.title', { session_id: 'sid-abc' })
+    expect(ctx.gateway.gw.request).not.toHaveBeenCalled()
+    await vi.waitFor(() => {
+      expect(ctx.transcript.sys).toHaveBeenCalledWith('title: demo title')
+    })
+  })
 })
 
 const buildCtx = (overrides: Partial<Ctx> = {}): Ctx => ({