Add MODE=pcb layout exam job with AI and deterministic checks.

Parallel pcb_status pipeline: parse board, classify domains/groups,
inventory traces, PE-LAY/PLC/SI/DRT checks, per-IC datasheet review.
Findings merge into the report UI. No auto-place or pcbnew write-back.

frontend/src/components/report/findings-list.tsx

@@ -42,6 +42,7 @@ export function FindingsList({ findings, graph, onViewReference, projectId, isRe
   const componentParam = searchParams.get("component");
   const reviewParam = searchParams.get("review");
   const searchParam = searchParams.get("q") ?? "";
+  const domainParam = searchParams.get("domain");
 
   const statusFilters = useMemo(() => {
     if (!statusParam) return new Set<FindingStatus>(["ERROR", "WARNING", "INFO"]);
@@ -84,9 +85,23 @@ export function FindingsList({ findings, graph, onViewReference, projectId, isRe
         const st = f.finding_id ? reviews?.[f.finding_id]?.state : undefined;
         if (st && st !== "open") return false;
       }
+      if (domainParam === "layout") {
+        const layout =
+          (f.finding_id || "").startsWith("PCB-") ||
+          f.source === "pcb_review" ||
+          (f.rule_id || "").startsWith("PE-PLC") ||
+          (f.rule_id || "").startsWith("PE-LAY") ||
+          (f.rule_id || "").startsWith("PE-SI") ||
+          (f.rule_id || "").startsWith("PE-DRT");
+        if (!layout) return false;
+      } else if (domainParam === "schema") {
+        const layout =
+          (f.finding_id || "").startsWith("PCB-");
+        if (layout) return false;
+      }
       return true;
     },
-    [statusFilters, componentParam, searchParam, reviewParam, reviews]
+    [statusFilters, componentParam, searchParam, reviewParam, reviews, domainParam]
   );
 
   const filtered = useMemo(() => {
@@ -131,6 +146,8 @@ export function FindingsList({ findings, graph, onViewReference, projectId, isRe
         onToggleNeedsReview={() =>
           updateParams({ review: reviewParam === "open" ? null : "open" })
         }
+        domain={domainParam ?? "all"}
+        onDomainChange={(v) => updateParams({ domain: v })}
         designators={designators}
       />
       <div className="space-y-1">