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/services/pcb_pipeline.py

@@ -7,6 +7,7 @@ untouched. Does not write ``.kicad_pcb`` or packing coordinates.
 
 from __future__ import annotations
 
+import json
 import logging
 from datetime import datetime, timezone
 from pathlib import Path
@@ -17,7 +18,7 @@ from backend.periscopex.cad_bridge import (
     cad_index_from_graph,
     write_cad_bridge,
 )
-from backend.periscopex.functional_groups import build_placement_plan
+from backend.periscopex.finding_engine import apply_decisions
 from backend.periscopex.graph import build_graph
 from backend.periscopex.models import ComponentConstraints, DesignGraph, LayoutGraph, ValidationReport
 from backend.periscopex.pcb_checks import assign_pcb_finding_ids, run_pcb_checks
@@ -227,6 +228,12 @@ async def run_pcb_pipeline(
             _step(project_id, "write_report", "running")
             assign_pcb_finding_ids(findings)
             annotate_findings_cad(findings, cad_index_from_graph(graph))
+            dec_path = ws.local_path("decisions.json")
+            if dec_path.is_file():
+                try:
+                    apply_decisions(findings, json.loads(dec_path.read_text()))
+                except Exception:
+                    logger.exception("decisions.json apply failed")
             summary: dict[str, int] = {"ERROR": 0, "WARNING": 0, "INFO": 0}
             for f in findings:
                 summary[f.status] = summary.get(f.status, 0) + 1

backend/services/validation.py

@@ -21,6 +21,7 @@ from typing import Awaitable, Callable
 
 log = logging.getLogger(__name__)
 
+from backend.periscopex.finding_engine import apply_decisions
 from backend.periscopex.models import (
     ComponentConstraints,
     ComponentType,
@@ -789,6 +790,12 @@ async def validate_design_async(
     def _write_report(paused: bool = False) -> ValidationReport:
         annotate_findings_cad(all_findings, graph.cad_index)
         assign_finding_ids(all_findings)
+        dec_path = existing_path.with_name("decisions.json")
+        if dec_path.is_file():
+            try:
+                apply_decisions(all_findings, json.loads(dec_path.read_text()))
+            except Exception:
+                log.exception("decisions.json apply failed")
         summary = {"total": len(all_findings), "ERROR": 0, "WARNING": 0, "INFO": 0}
         for f in all_findings:
             summary[f.status] = summary.get(f.status, 0) + 1