S00-012: Record blocked task and remediation handoff

Changes: Preserve incomplete work and blocker metadata for S00-012. This checkpoint does not mark implementation accepted.
Validation: Session ended with status blocked.
Blocker: Required automation suite fails in existing all-prompts budget test: S21-006 exceeds even a diagnostic 90000-character prompt limit. This blocks verification of the stdin remediation; production limit remains 80000.

Task: S00-012
Agent: manual-ci-cd-stdin-20261015b
Role: ci-cd
Action: escalate
Status: blocked

Task title: Fix runner prompt delivery after partial stdin timeout

tests/tooling/test_automation.py

@@ -220,6 +220,30 @@ else:
         self.assertEqual(state['tasks']['S00-001']['status'], 'blocked')
         self.assertTrue(state['retired_agents'])
 
+    def test_delayed_reader_receives_complete_large_utf8_prompt_and_eof(self):
+        fake = self.root / 'fake_agent.py'
+        fake.write_text(fake.read_text().replace(
+            "prompt=sys.stdin.read();assert 'fresh session' in prompt",
+            "import time;time.sleep(.5)\n"
+            "payload=sys.stdin.buffer.read()\n"
+            "assert payload == pathlib.Path(os.environ['LUMA_PROMPT_FILE']).read_bytes()\n"
+            "prompt=payload.decode('utf-8');assert 'fresh session' in prompt\n"
+            "print('Complete UTF-8 prompt and EOF:',len(payload),flush=True)"))
+        (self.root / 'state/first-blocker').write_text('skip fixture blocker')
+        prompt = 'This is a fresh session.\n' + '\U0001f642\u0416\n' * 20000
+        runner = RUN_MODULE.Runner(self.root, dict(self.config, max_sessions=1,
+                                                  timeout_seconds=3))
+        with patch.object(runner, 'prompt', return_value=prompt):
+            result = runner.run()
+        self.assertEqual(result['launched'], 1)
+        self.assertEqual(self.tracker.state()['tasks']['S00-001']['status'], 'review')
+        record_path = next((self.root / 'state/runs').glob('*/run.json'))
+        record = json.loads(record_path.read_text())
+        self.assertEqual(record['result'], {'status': 'review'})
+        self.assertEqual(record['scope_violations'], [])
+        self.assertIn('Complete UTF-8 prompt and EOF: ' + str(len(prompt.encode('utf-8'))),
+                      record_path.with_name('output.log').read_text())
+
     def test_scope_violation_quarantines_and_requires_input(self):
         runner = RUN_MODULE.Runner(self.root, {'git_commits': False, 'argv': [sys.executable, '-c', "from pathlib import Path;Path('bad-edit.txt').write_text('wrong scope')"]})
         result = runner.run()