fix(rfc): update stale specs to match v0.8.0 implementation
- Version header: v0.7.0+ → v0.8.0
- Section 2.4: type Task any removed, PERFORM replaced by PerformAsync
- Section 3.3+3.5: Startable/Stoppable return Result not error
- Section 4.3: PERFORM → PerformAsync with named action + Options
- Section 1.3: Added Process, API, Action, Task, Entitled, RegistryOf
- Section 8: Added WriteAtomic, NewUnrestricted, Root
- Section 9: Added Command.Managed field
- Description updated to include "permission"
Co-Authored-By: Virgil <virgil@lethean.io>