feat: replace custom Gitea client with MCP servers

Replace the bespoke GiteaHand httpx client and tools_gitea.py wrappers
with official MCP tool servers (gitea-mcp + filesystem MCP), wired into
Agno via MCPTools. Switch all session functions to async (arun/acontinue_run)
so MCP tools auto-connect. Delete ~1070 lines of custom Gitea code.

- Create src/timmy/mcp_tools.py with MCP factories + standalone issue bridge
- Wire MCPTools into agent.py tool list (Gitea + filesystem)
- Switch session.py chat/chat_with_tools/continue_chat to async
- Update all callers (dashboard routes, Discord vendor, CLI, thinking engine)
- Add gitea_token fallback from ~/.config/gitea/token
- Add MCP session cleanup to app shutdown hook
- Update tool_safety.py for MCP tool names
- 11 new tests, all 1417 passing, coverage 74.2%

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/timmy/cli.py

@@ -172,6 +172,8 @@ def interview(
     Asks Timmy a series of questions about his identity, capabilities,
     values, and operation to verify he is working correctly.
     """
+    import asyncio
+
     from timmy.interview import InterviewEntry, format_transcript, run_interview
     from timmy.session import chat
 
@@ -179,7 +181,9 @@ def interview(
 
     # Force agent creation by calling chat once with a warm-up prompt
     try:
-        chat("Hello, Timmy. We're about to start your interview.", session_id="interview")
+        asyncio.run(
+            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)
 
@@ -191,7 +195,7 @@ def interview(
 
     typer.echo("Starting interview...\n")
     transcript = run_interview(
-        chat_fn=lambda msg: chat(msg, session_id="interview"),
+        chat_fn=lambda msg: asyncio.run(chat(msg, session_id="interview")),
         on_answer=_on_answer,
     )