Add KiCad cad-bridge JSON and an action plugin for finding focus.

Write pinscope-findings.json from the report, keep symbol uuid and child-sheet on the graph, and let the pcbnew plugin jump to a footprint or show the schematic uuid when IPC focus is unavailable.

Co-authored-by: Cursor <cursoragent@cursor.com>

plugins/kicad/__init__.py

@@ -0,0 +1,8 @@
+"""KiCad plugin package. Registers the action when loaded inside pcbnew."""
+
+from __future__ import annotations
+
+try:
+    from . import pinscope_plugin  # noqa: F401
+except ImportError:
+    pass