Autonomous Dev Kit v6.6.3

Build-cache reuse and explicit job-resource closeout.

• Execution, implementer and finishing guidance now prefers native/stable compatible Go caches, preserves inherited GOCACHE and requires reasons/ownership for cold-cache isolation. Docker mounts and persistent database data require explicit classification.
• Optional POSIX scripts/job-resources.py records session/job resources, explicit success/failure closeout and conservative review hints. Stable locks, no-follow descriptor operations and atomic JSON writes protect cooperating concurrent writers; corrupt/unknown metadata is preserved.
• Active, failed, unknown, reusable, database, Docker-volume and worktree resources stay protected. Overlapping protected paths, links, worktree markers, changed/unreadable trees and inspection limits suppress candidate hints. The helper never runs resource commands or deletes resources.
• Added resource safety/concurrency regressions, guidance contracts and Ubuntu CI. Direct CLI and actual repeated Go-build smoke validate preservation/reuse; source checks do not establish host callback invocation.

No existing cache migration, cleanup daemon, automatic deletion or new lifecycle hook. Adoption is explicit guidance/CLI use and cannot guarantee bounded disk usage. Install in a safe maintenance window: native upgrades can prune older plugin paths used by active sessions.