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/executor.py

@@ -354,6 +354,8 @@ class Run:
             self.preflight()
         except Refused as refusal:
             return {"outcome": "refused", "reason": str(refusal), "run_id": None, "effects": False}
+        if self.d.should_stop():  # the founder's stop before the one irreversible act: nothing is spent
+            return {"outcome": "refused", "reason": "stopped_before_consume", "run_id": None, "effects": False}
         self.start_wall, self.start_mono = self.d.wall(), self.d.monotonic()
         try:
             self.consume()