Show Action on finding cards and inject PCB geometry into AI context.

Layout and AI findings always get action (fallback recommendation). The card
renders that sentence in the body. PCB review context now includes vias under
the footprint, copper thickness, nearby widths, courtyard, and keepout polygons.

backend/services/pcb_validation.py

@@ -6,6 +6,7 @@ import logging
 from pathlib import Path
 
 from backend.periscopex.cad_bridge import annotate_findings_cad, cad_index_from_graph
+from backend.periscopex.finding_engine import complete_findings
 from backend.periscopex.functional_groups import FunctionalGroupsReport
 from backend.periscopex.models import ComponentType, DesignGraph, Finding, LayoutGraph
 from backend.periscopex.pcb_inventory import PcbInventoryReport
@@ -27,8 +28,14 @@ def _ensure_recs(findings: list[Finding]) -> None:
     for f in findings:
         if f.source in (None, "review"):
             f.source = "pcb_review"
-        if not (f.recommendation or "").strip():
-            f.recommendation = _FIX
+        rec = (f.recommendation or "").strip()
+        act = (f.action or "").strip()
+        if not rec:
+            rec = act or _FIX
+            f.recommendation = rec
+        if not act:
+            f.action = rec
+    complete_findings(findings)
 
 
 def _has_library_extraction(cons) -> bool: