harvest-loop — Field Session → FH Self-Evolution Pipeline

Automatically absorbs patterns/conflicts/discoveries from field sessions back into the FH ecosystem. Internalizes as a pipeline the return loop from field projects to the harness that was previously done manually. One of the core functions is real-time detection and blocking of Semantic Drift — where agent terminology gradually diverges in meaning as sessions grow longer.

Operation Modes

Mode	Description	Trigger
Forced mode	Auto-runs at end of local development session. Executes without approval, only confirms final suggestions	Session wrap-up rules in hub CLAUDE.md
Lightweight mode	Immediate harvest after Wave completion. Skip Steps 3/3.5/4 — prioritize fast recording	agent-composer Step 4-c (2+ new files or 3+ existing files changed, or M-tier resolved)
Proposal mode	External FH users — confirms "run harvest-loop?" before executing	User utterance or `/harvest-loop`

Simplification guard: Sessions that only browsed/explored (no code changes or outputs) auto-skip even in forced mode.