feat: add set_footprint_type tool for placement attribute control

Adds a `set_footprint_type` MCP tool to set a placed footprint's
placement type (through_hole / smd / unspecified) plus the optional
exclude_from_pos_files / exclude_from_bom / not_in_schematic flags.
These attributes gate inclusion in pick-and-place (.pos) exports and
were previously unreachable: edit_component only handled
reference/value/footprint and get_component_properties did not report
the placement type at all.

- python/commands/component.py: SWIG (pcbnew) handler via
  Set/GetAttributes + the dedicated exclusion setters; extends
  get_component_properties to report a human-readable `type` plus the
  three exclusion flags.
- python/kicad_interface.py: IPC (kipy) handler setting
  attributes.mounting_style and the exclusion fields over the proto
  API with begin_commit/update_items/push_commit so changes are live in
  the KiCAD UI; registered in the command map, the IPC handler map, and
  the realtime/IPC whitelist; SWIG fallback on proto error.
- src/tools/component.ts: tool registration with zod schema.
- tests/test_set_footprint_type.py: 26 unit tests over both backends
  plus the extended get_component_properties response.
- pyproject.toml: add `fitz` (PyMuPDF) to mypy ignore_missing_imports
  overrides; pre-existing gap that fails mypy on any edit to files
  importing it (board/view.py, kicad_interface.py).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

pyproject.toml

@@ -33,6 +33,7 @@ module = [
     "cairosvg",
     "sexpdata",
     "skip",
+    "fitz",
     "kipy",
     "kipy.*",
     "schematic",