NK-WP-0056-T07: founder kill switch and execution findings in posture feedback

- cli: SIGTERM/SIGINT (kubectl delete job) sets the stop flag; the runner stops at the next
  step boundary and reverts. A stop before consume refuses and spends nothing.
- posture feedback v0.1 section 4a: --receipts reads bounded-executor events through the
  receipt validator: execution-receipt-missing, -not-completed, -reverted, -budget-pressure,
  and the aggregate execution-recurring-revert. Owners come from the authoritative
  tools/posture-feedback/execution-owners.yaml, never inferred.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Assistant: claude-code
Assistant-Model: opus
Assistant-Process: 523928@bnt-lap001
Assistant-Session: 6c737afb-9c14-4152-9f02-477214b9c350

bounded-executor/tests/test_approval_request.py

@@ -336,5 +336,20 @@ class RequestPhase(Base):
         self.assertNotIn(SECRET, text)
 
 
+
+
+class KillSwitch(unittest.TestCase):
+    def test_sigterm_sets_the_stop_flag_the_runner_reads(self):
+        import os
+        import signal
+        before = {sig: signal.getsignal(sig) for sig in (signal.SIGTERM, signal.SIGINT)}
+        self.addCleanup(lambda: [signal.signal(sig, h) for sig, h in before.items()])
+        self.addCleanup(CLI.STOP.clear)
+        CLI.STOP.clear()
+        CLI.install_kill_switch()
+        os.kill(os.getpid(), signal.SIGTERM)
+        self.assertTrue(CLI.STOP.wait(2))
+
+
 if __name__ == "__main__":
     unittest.main()