chore: apply Black formatting and add tests for get_wire_connections
- Apply Black formatting to wire_connectivity.py, kicad_interface.py,
and tool_schemas.py (changed files only)
- Add python/tests/conftest.py with pcbnew/skip C-extension stubs
- Add python/tests/test_wire_connectivity.py with 29 unit tests covering
schema validation, handler dispatch, parameter validation, and core
logic (_to_iu, _parse_wires, _build_adjacency, _find_connected_wires,
get_wire_connections)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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