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24a7b146fa
Config observers run synchronously in a reactor turn and must not
suspend. Split the previous monolithic async update_config() coroutine
into two phases:
Sync (runs in the observer, never suspends):
- S3: atomically swap _cfg (lw_shared_ptr) and set a credentials
refresh flag.
- GCS: install a freshly constructed client; stash the old one for
async cleanup.
- storage_manager: update _object_storage_endpoints and fire the
async cleanup via a gate-guarded background fiber.
Async (gate-guarded background fiber):
- S3: acquire _creds_sem, invalidate and rearm credentials only if
the refresh flag is set.
- GCS: drain and close stashed old clients.