fix(relay): classify an empty region catalog as catalog-incomplete, not all-unreachable

src/main/runtime/relay/relay-region-probe-log.test.ts

@@ -185,6 +185,16 @@ describe('Relay region probe log', () => {
     expect(probeEvents(events)[0]!.reason).toBe('all-unreachable')
   })
 
+  it('reports an empty catalog as catalog-incomplete, since nothing was probed', async () => {
+    const { resolver, events } = resolverWithLog({
+      path: userDataPath(),
+      fetch: catalogFetch([]),
+      probe: sampledProbe({})
+    })
+    await expect(resolver.resolve()).resolves.toBeUndefined()
+    expect(probeEvents(events)[0]).toMatchObject({ reason: 'catalog-incomplete', regions: [] })
+  })
+
   it('reports a lone flapping region as all-rejected, and a lone healthy one as catalog-incomplete', async () => {
     const path = userDataPath()
     const flapping = resolverWithLog({

src/main/runtime/relay/relay-region-probe-log.ts

@@ -131,7 +131,12 @@ function refreshReason(
     return best && selected.region !== best.region ? 'held-previous' : 'measured'
   }
   // Reachability first: a support census counting all-unreachable to spot
-  // client-side network breakage must not lose those runs to a roll wave.
+  // client-side network breakage must not lose those runs to a roll wave. An
+  // empty catalog (every region drained at once) probed nothing, so it is the
+  // catalog that is incomplete, not the network.
+  if (reports.length === 0) {
+    return 'catalog-incomplete'
+  }
   if (reports.every((report) => report.verdict === 'unreachable')) {
     return 'all-unreachable'
   }