Ship Sprint 0 CAD foundations so findings, KiCad hierarchy, BOM match, eval, and optional PCB ingest have a stable contract.

Extend Finding with rule_id/net/pins, flatten multi-sheet .kicad_sch, flag MPN mismatches, score simple_project, and parse .kicad_pcb without running layout DRC.

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

backend/pinscopex/pin_mux_check.py

@@ -169,4 +169,7 @@ def _feasibility_finding(
         ),
         recommendation=rec,
         reference=f"{mpn or ref} alternate-function table",
+        net=net_name,
+        pins=[f"{ref}.{pin_num}"],
+        rule_id="PS-MUX-001",
     )