enable track_progress for comments, fix mcp config (#558)

* enable track_progress for comments

* refactor: pass mode explicitly to prepareMcpConfig

Update prepareMcpConfig to receive the mode parameter from its callers
instead of detecting agent mode by checking context.inputs.prompt.
This makes mode determination explicit and controlled by the caller.

Also update all test cases to include the required mode parameter
and fix agent mode test expectations to match new behavior where
MCP config is only included when tools are explicitly allowed.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

* fix test

---------

Co-authored-by: Claude <noreply@anthropic.com>

tests/modes/detector.test.ts

@@ -200,7 +200,7 @@ describe("detectMode with enhanced routing", () => {
       };
 
       expect(() => detectMode(context)).toThrow(
-        /track_progress is only supported for pull_request and issue events/,
+        /track_progress is only supported /,
       );
     });