Tighten PCB findings: actions, stitch gating, real copper.

Fill action on every finding and show it in the report. Stitch/return only
on large HS/power nets. Parse stackup thickness, arcs, and vias from the
board. IC courtyard pad copper is not PE-PLC-004 RULE. Recommended RC/cap
stay REVIEW.

tests/test_finding_engine.py

@@ -133,3 +133,26 @@ def test_same_object_pcb_and_schema():
         assert obj.finding_class
         assert obj.provenance
         assert obj.evidence_status
+        assert (obj.action or "").strip()
+
+
+def test_empty_recommendation_gets_action():
+    f = Finding(designator="U1", finding="note", status="INFO", source="review")
+    complete_finding(f)
+    assert f.action.strip()
+    assert f.recommendation.strip() == f.action.strip()
+
+
+def test_recommended_rc_cap_is_review_not_rule():
+    f = Finding(
+        designator="C1",
+        finding="10n vs 100n",
+        why="datasheet typical 100n",
+        status="WARNING",
+        rule_id="PE-DEC-002",
+        source="passive_rail_check",
+    )
+    complete_finding(f)
+    assert f.finding_class == "REVIEW"
+    assert f.provenance == "RECOMMENDED"
+    assert f.status != "ERROR"