Apply completionRewardBundle.reputationGrants via ReputationOperations with
compensating rollback; thread faction stores through quest wiring; add operator
chain Bruno helper and grid-contract accept success; update README and E7.M3 docs.
Wire QuestStateOperations.TryAccept at POST /game/players/{id}/quests/{questId}/accept
with shared quest row projection, integration tests, and Bruno accept flows.