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/lib/api.ts

@@ -110,6 +110,8 @@ function mapProject(p: Record<string, unknown>): Project {
     netlistSubdesigns: (p.netlist_subdesigns as string[] | null) ?? null,
     placementStatus: (p.placement_status as Project["placementStatus"]) ?? "draft",
     placementState: (p.placement_state as Record<string, unknown> | null) ?? null,
+    pcbStatus: (p.pcb_status as Project["pcbStatus"]) ?? "draft",
+    pcbState: (p.pcb_state as Record<string, unknown> | null) ?? null,
   };
 }
 
@@ -614,6 +616,47 @@ export function placementEventsUrl(projectId: string): string {
   return `${BASE}/api/pipeline/${projectId}/placement/events`;
 }
 
+export async function startPcbPipeline(projectId: string) {
+  const res = await authFetch(
+    `${BASE}/api/pipeline/${projectId}/pcb/start`,
+    { method: "POST" },
+  );
+  if (!res.ok) {
+    const err = await res.json().catch(() => ({ detail: "Failed to start PCB review" }));
+    throw new Error(err.detail || "Failed to start PCB review");
+  }
+  return res.json();
+}
+
+export async function cancelPcbPipeline(projectId: string) {
+  const res = await authFetch(
+    `${BASE}/api/pipeline/${projectId}/pcb/cancel`,
+    { method: "POST" },
+  );
+  if (!res.ok) {
+    const err = await res.json().catch(() => ({ detail: "Failed to cancel PCB review" }));
+    throw new Error(err.detail || "Failed to cancel PCB review");
+  }
+  return res.json();
+}
+
+export function pcbEventsUrl(projectId: string): string {
+  return `${BASE}/api/pipeline/${projectId}/pcb/events`;
+}
+
+export async function fetchPcbInventory(projectId: string): Promise<{
+  nets: Array<Record<string, unknown>>;
+  domains: string[];
+  group_count: number;
+}> {
+  const res = await authFetch(`${BASE}/api/pipeline/${projectId}/pcb/inventory`);
+  if (!res.ok) {
+    const err = await res.json().catch(() => ({ detail: "PCB inventory not found" }));
+    throw new Error(err.detail || "PCB inventory not found");
+  }
+  return res.json();
+}
+
 export async function fetchPlacementPlan(projectId: string): Promise<PlacementPlan> {
   const res = await authFetch(`${BASE}/api/pipeline/${projectId}/placement/plan`);
   if (!res.ok) {

frontend/src/lib/types.ts

@@ -283,6 +283,8 @@ export interface Project {
   // Placement pipeline (parallel to analysis — topology only).
   placementStatus?: "draft" | "queued" | "running" | "complete" | "error" | "cancelled";
   placementState?: Record<string, unknown> | null;
+  pcbStatus?: "draft" | "queued" | "running" | "complete" | "error" | "cancelled";
+  pcbState?: Record<string, unknown> | null;
 }
 
 export type RoleHint =