commitment-ledger-bench: sealed confirmatory record (D-001–D-021)

Sealed archival deposit of a preregistered benchmark study of cancellation compliance in LLM agents: append-only decisions log D-001 through D-021, preregistration hash deposits, frozen instrument, and complete confirmatory result records for four models (qwen2.5 3B/7B/14B; claude-haiku-4-5; claude-sonnet-4-6 cross-model replication arm). Deposited under embargo pending release decision. SHA-256 of archive: d26b3fc8e749cc5666666031892ee16d095771c7a7d97235e27d44321b208e42. Git HEAD at deposit: cc09008221be5a73b7a74a775cc3b97e98e0f646.