At agent launch, composeContract reads MOSAIC_AGENT_CLASS (exported into the pane env by the companion A3a goal) and injects the agent's resolved persona role contract into the system prompt, so its identity (mandate + boundaries) is resident from the first turn. Override-aware: resolution goes through the persona resolver, so a customized persona in fleet/roles.local/ wins over the baseline fleet/roles/ of the same class — the launch-time proof of AC-NS-7. Tolerant: any miss (unset/empty/ unknown class, missing file) no-ops silently and never throws during launch, mirroring readFleetCommsBlock. Persona is injected BEFORE the fleet comms block (identity first, then how-to-reach-peers). Adds a synchronous resolvePersonaSync / extractClassesFromDirSync twin in fleet-personas.ts (composeContract is sync and cannot await), sharing the same extraction semantics via a pure accumulateEntry helper (no drift). Co-Authored-By: Claude Opus 4.8 <[email protected]>