Merge pull request 'fix: persistent event loop in CLI interview — no more Event loop is closed' (#42) from fix/cli-event-loop into main

Replace repeated asyncio.run() calls with a single event loop that
persists across all interview questions. The old approach created and
destroyed loops per question, orphaning MCP stdio transports and
causing 'Event loop is closed' errors on ~50% of questions.

Also adds clean shutdown: closes MCP sessions before closing the loop.

Ref #36

src/timmy/cli.py

@@ -179,28 +179,44 @@ def interview(
 
     typer.echo("Initializing Timmy for interview...\n")
 
-    # Force agent creation by calling chat once with a warm-up prompt
+    # Use a single persistent event loop for the entire interview.
+    # Calling asyncio.run() per question kills the loop between calls,
+    # orphaning MCP stdio transports and causing "Event loop is closed."
+    loop = asyncio.new_event_loop()
+    asyncio.set_event_loop(loop)
+
     try:
-        asyncio.run(
-            chat("Hello, Timmy. We're about to start your interview.", session_id="interview")
+        # Force agent creation by calling chat once with a warm-up prompt
+        try:
+            loop.run_until_complete(
+                chat("Hello, Timmy. We're about to start your interview.", session_id="interview")
+            )
+        except Exception as exc:
+            typer.echo(f"Warning: Initialization issue — {exc}", err=True)
+
+        def _on_answer(entry: InterviewEntry) -> None:
+            typer.echo(f"[{entry.category}]")
+            typer.echo(f"  Q: {entry.question}")
+            typer.echo(f"  A: {entry.answer}")
+            typer.echo()
+
+        typer.echo("Starting interview...\n")
+        transcript = run_interview(
+            chat_fn=lambda msg: loop.run_until_complete(chat(msg, session_id="interview")),
+            on_answer=_on_answer,
         )
-    except Exception as exc:
-        typer.echo(f"Warning: Initialization issue — {exc}", err=True)
 
-    def _on_answer(entry: InterviewEntry) -> None:
-        typer.echo(f"[{entry.category}]")
-        typer.echo(f"  Q: {entry.question}")
-        typer.echo(f"  A: {entry.answer}")
-        typer.echo()
+        # Print full transcript at the end
+        typer.echo("\n" + format_transcript(transcript))
+    finally:
+        # Clean shutdown: close MCP sessions, then the loop
+        try:
+            from timmy.mcp_tools import close_mcp_sessions
 
-    typer.echo("Starting interview...\n")
-    transcript = run_interview(
-        chat_fn=lambda msg: asyncio.run(chat(msg, session_id="interview")),
-        on_answer=_on_answer,
-    )
-
-    # Print full transcript at the end
-    typer.echo("\n" + format_transcript(transcript))
+            loop.run_until_complete(close_mcp_sessions())
+        except Exception:
+            pass
+        loop.close()
 
 
 @app.command()