community-pool-disbursement.v1 invariants

community-pool-disbursement.v1 is the smallest policy-facing record for one community-pool outflow in the host-ledger rail.

Invariants

1. pool/account-id MUST identify a ledger-account.v1 whose account/purpose is community-pool.
2. approved-by/id MUST be canonical council:did:key:....
3. purpose ∈ { ubc-subsidy, infrastructure-support, emergency-relief }.
4. basis/refs MUST be non-empty.
5. ledger-transfer/id MUST point at the append-only transfer that executed the outflow.
6. The signed surface is orbiplex-community-pool-disbursement-v1\x00 || deterministic_cbor(payload_without_signature).
7. This artifact records the approved outflow and its purpose; it does not replace ledger-transfer.v1 as the financial source of truth.