Compaction-Refresh Mechanism (M1: Claude+Pi)
Framework-native (packages/mosaic) compaction-refresh mechanism per ratified SPEC-v5 + R1-R6. Authenticated external lease broker (SO_PEERCRED identity, broker-minted session_id), whole mutator-class gate (revoke-first/promote-last), compaction-observer revoke, verbatim-hashed normative fragments (B_payload/H_payload no-self-reference), broker-minted one-time receipt-challenge (COMPUTE=broker/COPY=model), constrained recovery command + mosaic-context-refresh skill wrapper, T-C server-side branch-protection line. WI-0 = R4 Gate0 runtime-evidence BUILD-ADMISSION gate (FIRST; failed item returns design to planner). Opus-SECREV mandatory on broker/gate/receipt/socket surfaces. Authority: BUILD-BRIEF 89fdbc27, SPEC-v5 a6d07ade, RATIFICATION bac58319.
