[UroojFatima-052]

Refs #415

Phase 3: removes skillware.core.loader from [[tool.mypy.overrides]] and fixes the 2 errors that surfaced. Typing only, no behavior change.

Changes

• loader.py (load_skill): manifest: Dict[str, Any] = {}. mypy can't infer the type of an empty dict literal, so it's annotated explicitly.
• loader.py (to_gemini_tool): the function declaration dict is passed through types.FunctionDeclaration.model_validate(...) before going into types.Tool. Tool.function_declarations is typed as a list of FunctionDeclaration, and pydantic was already coercing the dict at runtime, so this does the same conversion explicitly. Output is unchanged: test_to_gemini_tool still sees OBJECT / STRING types.
• pyproject.toml: loader dropped from the overrides list.
• CHANGELOG.md: Unreleased entry.

Verification

• mypy skillware: Success, no issues in 25 files
• black --check / flake8 on loader.py: clean
• pytest tests/test_loader.py: 35 passed

Only skillware.cli remains in the overrides list now (Phase 4).

[rosspeili]

LGTM @UroojFatima-052, merging as is. <3