probe production document browser capability

tests/live-runtime-probe.mjs

@@ -42,13 +42,17 @@ checks.health = await probe('/api/health', 'ok');
 // /api/health and /api/ready use the same { ok: true } probe contract. The
 // readiness payload also includes a separate `ready` diagnostic field.
 checks.ready = await probe('/api/ready', 'ok');
-const missingHeaders = requiredHeaders.filter(name => [checks.home, checks.health, checks.ready].some(check => check?.headers?.[name] == null));
+// The EKAP document fallback depends on the bundled browser being available;
+// check its public capability endpoint without opening a document or mutating
+// any account data.
+checks.documents = await probe('/api/documents/config', 'tarayiciVar');
+const missingHeaders = requiredHeaders.filter(name => [checks.home, checks.health, checks.ready, checks.documents].some(check => check?.headers?.[name] == null));
 const report = {
   base,
   readOnly: true,
   checkedAt: new Date().toISOString(),
   checks,
-  pass: checks.home?.status === 200 && checks.health?.status === 200 && checks.health.apiSuccess === true && checks.ready?.status === 200 && checks.ready.apiSuccess === true && missingHeaders.length === 0,
+  pass: checks.home?.status === 200 && checks.health?.status === 200 && checks.health.apiSuccess === true && checks.ready?.status === 200 && checks.ready.apiSuccess === true && checks.documents?.status === 200 && checks.documents.apiSuccess === true && missingHeaders.length === 0,
   missingHeaders,
 };