Narrower slice per Hmbown's review: typed zone structs as foundation
without wiring into the request path. Future phases will integrate
AppendLog/TurnScratch/ThreeZoneRequest into turn_loop.
- prompt_zones.rs (663 lines, 16 tests): PinnedPrefix / FrozenPrefix /
PrefixDrift (ready), AppendLog / TurnScratch / ThreeZoneRequest
(scaffolding, #[allow(dead_code)])
- FrozenPrefix: full tool JSON hash (name+desc+schema), raw-text
fast-path in verify(), cache_control preserved in build_messages()
- /cache zones subcommand with three-zone status display
- merge_compaction_summary: zone affiliation doc comment
- No turn_loop/session changes — engine continues using
PrefixStabilityManager / MessageRequest as before
Justin Gao
d897c2e5b8