v1.21.1 — the check that asked the wrong plane who hands out ids

[sshlg]

check refused every idRegisters entry on backend: "fs" + leaseBackend: "git", while reserve DEC in that same repository allocated race-free through refs/agent-sync/ids/* at the remote. Repositories with a local record plane had to drop their DEC/OQ registers and take numbers by hand.

Root cause. reserve allocates when the record plane orders writes OR the lease is git. check asked only the record plane (probe.is_lease_authority).

Fix.

• One predicate, id_allocator(cfg, adapter), answers for reserve, release_id, check and the generated snapshot (which now names the allocator).
• Still refused, by both commands: a non-ordering plane (fs, or a cloud plane degraded to fs) with leaseBackend: "local"; leaseBackend: "git" pointed at a remote that does not exist.
• A missing lease remote is refused by name in acquire and reserve. It used to read as "held by another run" / "another allocator is racing".

Tests. check_check_and_reserve_agree_on_who_allocates_ids drives all three configurations through both commands against a bare remote. It was written first and failed 4 ways on the old code. Two new self-test plants (the record-plane-only condition, the phantom contention) are caught, and so is the retargeted check blesses a register nobody can reserve plant, which had silently stopped applying.

Gate (local). npm test EXIT=0: validate PASS v1.21.1 (also on Python 3.9.6), SELF-TEST PASS (64 fixtures), claim cell 27, session hooks 13, installer 11. Audit regressions 13/13, evals OK, pinned house audit 0 GAP / 18 PASS, and claude plugin validate --strict passed for . and plugins/agent-sync.

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