Follow-up to the salvaged #30728:
- Gateway already exports _HERMES_GATEWAY=1 at startup (gateway/run.py) and
cli.py already keys off it. Drop the redundant new HERMES_IN_GATEWAY var;
guard stop/restart on _HERMES_GATEWAY instead. One marker for one fact.
- Drop the greedy \bgateway.*restart alternation from the cron lifecycle
filter — it false-positived on legit prompts that merely mention an
unrelated gateway + a restart (API/payment gateway monitoring). The
specific 'hermes gateway (restart|stop|start)' pattern already covers the
real command.
- Rework the two negative guard tests to sentinel the first downstream call
so they don't drive real signal delivery (tripped the live-system guard).
- Add false-positive regression cases to test_safe_commands.
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