feat(places): town, locality, authority and outcode routes

Every generateStaticParams is gated behind PRERENDER_PLACES and wrapped in the
same try/catch the school route uses. The plan claimed authority pages were
'few enough to always prebuild' — but few enough still means the API must be
reachable at build time, and in CI it is not: the build failed with
ECONNREFUSED rather than degrading to ISR.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015mWQnpye9F299NVRCCSRvj

docs/superpowers/plans/2026-08-21-w2-location-layer.md

@@ -1362,10 +1362,14 @@ export async function generateStaticParams(): Promise<Array<{ place: string }>>
   // Off by default: ~2,000 place routes cannot be built in CI on every deploy.
   // Matches the PRERENDER_SCHOOLS gate on the school route.
   if (process.env.PRERENDER_PLACES !== '1') return [];
-  const { fetchPlaces } = await import('@/lib/places');
-  return (await fetchPlaces())
-    .filter((p) => p.kind === 'town' || p.kind === 'locality')
-    .map((p) => ({ place: p.slug }));
+  try {
+    return (await fetchPlaces())
+      .filter((p) => p.kind === 'town' || p.kind === 'locality')
+      .map((p) => ({ place: p.slug }));
+  } catch (error) {
+    console.warn('generateStaticParams: API unreachable, falling back to on-demand ISR.', error);
+    return [];
+  }
 }
 
 async function resolve(slug: string) {
@@ -1517,11 +1521,20 @@ export const revalidate = 604800;
 export const dynamicParams = true;
 
 export async function generateStaticParams(): Promise<Array<{ la: string }>> {
-  // Only ~154 authorities, so these are cheap enough to always prebuild —
-  // unlike towns, which are gated behind PRERENDER_PLACES.
-  return (await fetchPlaces())
-    .filter((p) => p.kind === 'authority')
-    .map((p) => ({ la: p.slug }));
+  // Gated like every other prerender in this app. There are only ~154
+  // authorities, but "few enough to always build" still means the API must be
+  // reachable at build time, and in CI it is not — the build fails with
+  // ECONNREFUSED rather than degrading. The catch is the same fallback the
+  // school route uses.
+  if (process.env.PRERENDER_PLACES !== '1') return [];
+  try {
+    return (await fetchPlaces())
+      .filter((p) => p.kind === 'authority')
+      .map((p) => ({ la: p.slug }));
+  } catch (error) {
+    console.warn('generateStaticParams: API unreachable, falling back to on-demand ISR.', error);
+    return [];
+  }
 }
 
 export async function generateMetadata({ params }: Props): Promise<Metadata> {
@@ -1581,9 +1594,14 @@ export const dynamicParams = true;
 export async function generateStaticParams(): Promise<Array<{ outcode: string }>> {
   // 1,760 of these; same CI budget argument as the town routes.
   if (process.env.PRERENDER_PLACES !== '1') return [];
-  return (await fetchPlaces())
-    .filter((p) => p.kind === 'outcode')
-    .map((p) => ({ outcode: p.slug }));
+  try {
+    return (await fetchPlaces())
+      .filter((p) => p.kind === 'outcode')
+      .map((p) => ({ outcode: p.slug }));
+  } catch (error) {
+    console.warn('generateStaticParams: API unreachable, falling back to on-demand ISR.', error);
+    return [];
+  }
 }
 
 export async function generateMetadata({ params }: Props): Promise<Metadata> {