claims pending commands with a lease and parsed payload

Pin the @cv/server library surface: the actor-id round-trip used by every op envelope, the changes-stream broker that fans out SSE, the compression helper for sub-doc snapshots, the dispatch-fallback adapter shell, job records + jobcache commands and lookup, key entitlements, LLM error classification, the mirror writer, the process-request claim and lease flow, score recompute, stage attempts ledger, workspace ops, and the workspace sub-doc split commit path.