Apply the finding engine to schematic and PCB reviews.

FACT, REQUIREMENT, and INFERENCE are separate fields; datasheet provenance
lives in the rule DB so Recommended cannot stay ERROR; LLM output is REVIEW.
Designer decisions persist across rescans. Schematic and PCB share one library
and the same finding object in the report UI.

backend/periscopex/pcb_checks.py

@@ -5,7 +5,7 @@ from __future__ import annotations
 import logging
 from collections import Counter
 
-from backend.periscopex.derating import build_derating_table
+from backend.periscopex.finding_engine import complete_findings
 from backend.periscopex.models import DesignGraph, Finding, LayoutGraph
 from backend.periscopex.pcb_net_match import check_pcb_net_match
 from backend.periscopex.pcb_power_thermal import (
@@ -31,6 +31,7 @@ def assign_pcb_finding_ids(findings: list[Finding]) -> None:
         f.finding_id = f"PCB-{f.designator}-{counter[f.designator]:03d}"
         if not (f.recommendation or "").strip():
             f.recommendation = _FALLBACK_FIX
+    complete_findings(findings)
 
 
 def check_pcb_derating(graph: DesignGraph) -> list[Finding]: