fix: resolve mypy unused-ignore error for tomli import

- Remove inline type: ignore comment from config.py
- Add tomli to mypy overrides for cross-version compatibility
- Works on Python 3.10 (tomli installed) and 3.11+ (tomllib builtin)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: sattyamj-attri

pyproject.toml

@@ -121,6 +121,8 @@ module = [
     "fastmcp.*",
     "mcp",
     "mcp.*",
+    "tomli",
+    "tomli.*",
 ]
 ignore_missing_imports = true
 

src/agent_airlock/config.py

@@ -17,7 +17,7 @@
 if sys.version_info >= (3, 11):
     import tomllib
 else:
-    import tomli as tomllib  # type: ignore[import-not-found]
+    import tomli as tomllib
 
 
 @dataclass