fix(hooks): expose mma_tier_usage in /api/gui/mma_status; install pytest-timeout

- api_hooks.py: add mma_tier_usage to get_mma_status() response
- pytest-timeout 2.4.0 installed so mark.timeout(300) is enforced in CI

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

pyproject.toml

@@ -15,6 +15,7 @@ dependencies = [
     "tree-sitter>=0.25.2",
     "tree-sitter-python>=0.25.0",
     "mcp>=1.0.0",
+    "pytest-timeout>=2.4.0",
 ]
 
 [dependency-groups]