api.releaseConcurrencyLimit()
Atomically releases one acquired concurrency slot, preserving slots held by other workers.
Notes:
- Releases only a slot acquired by this runtime invocation; a missing local ownership token is a no-op.
- For a slot acquired with leaseOwnerId, pass that same owner to release it from another SDK request.
- Call exactly once after a successful admission; do not release after admission returned false.
- Owner fencing prevents late cleanup from releasing a slot acquired by another invocation.
- Each invocation may acquire several slots; each release consumes one of its own tokens.
- Unavailable with
readOnly: true(throws an error).

