Run ImpedenceFinder Z0 on routed signal nets during project analysis.

Pipeline samples PCB traces when stackup εr/h is present; power/ground are skipped. Named nets can be re-analyzed from the Impedance tab.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/lib/api.ts

@@ -11,6 +11,7 @@ import type {
   DesignGraph,
   DeratingRow,
   ImpedanceKind,
+  ImpedanceNetsReport,
   ImpedanceStackupResult,
   ImpedanceTraceResult,
   EdifSubDesign,
@@ -609,6 +610,43 @@ export async function computeImpedance(body: {
   return res.json();
 }
 
+export async function fetchImpedanceNets(
+  projectId: string,
+): Promise<ImpedanceNetsReport> {
+  const res = await authFetch(
+    `${BASE}/api/projects/${projectId}/impedance/nets`,
+  );
+  if (!res.ok) {
+    const detail = await res.json().catch(() => ({ detail: res.statusText }));
+    throw new Error(
+      typeof detail.detail === "string" ? detail.detail : "Impedance nets failed",
+    );
+  }
+  return res.json();
+}
+
+export async function analyzeImpedanceNets(
+  projectId: string,
+  nets: string[],
+  pitch_mm?: number,
+): Promise<ImpedanceNetsReport> {
+  const res = await authFetch(
+    `${BASE}/api/projects/${projectId}/impedance/nets`,
+    {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({ nets, pitch_mm }),
+    },
+  );
+  if (!res.ok) {
+    const detail = await res.json().catch(() => ({ detail: res.statusText }));
+    throw new Error(
+      typeof detail.detail === "string" ? detail.detail : "Impedance nets failed",
+    );
+  }
+  return res.json();
+}
+
 export async function fetchReport(
   projectId: string,
 ): Promise<ValidationReport> {

frontend/src/lib/types.ts

@@ -364,6 +364,27 @@ export interface ImpedanceStackupResult {
   kicad_dru: string;
 }
 
+export interface ImpedanceNetRow {
+  net_name: string;
+  length_mm?: number;
+  branch_count?: number;
+  is_differential?: boolean;
+  partner_net_name?: string | null;
+  topologies?: string[];
+  z0_min_ohms?: number | null;
+  z0_max_ohms?: number | null;
+  z0_avg_ohms?: number | null;
+  flags?: string[];
+  sample_count?: number;
+  error?: string;
+}
+
+export interface ImpedanceNetsReport {
+  pitch_mm: number;
+  nets: ImpedanceNetRow[];
+  skipped: string | null;
+}
+
 export interface NetlistPreviewDesignator {
   ref: string;
   pins: { number: string; net_name: string }[];