Merge 'fix(prime-agent): project indicator on turn_start' into main

src/cli/tests/commands/prime-agent.test.ts

@@ -543,6 +543,9 @@ describe('config prime-agent', () => {
     expect(ext).toContain("placement: 'belowEditor'");
     // Still set the status: pi's footer does render it.
     expect(ext).toContain('ctx.ui.setStatus(STATUS_KEY');
+    // prime-agent emits session_start only from reload(), never at startup, so
+    // a session_start-only indicator stays blank until the first switch.
+    expect(ext).toContain("pi.on('turn_start'");
   });
 
   it('the installed switcher filters the project list before showing it', async () => {