Redefine request-retry as additional credential retry rounds and
enforce max-retry-credentials per round. Home dispatch now carries
excluded and pinned auth constraints, supports remote retry limits, and
propagates cooldown retry-after metadata across exhausted rounds.
Move Antigravity upstream retries under conductor ownership to avoid
double-consuming retry attempts. Update configuration comments and add
coverage for Home retry rounds, cooldown handling, pinned credentials,
and legacy dispatcher compatibility.
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