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Five Invariants (never violate)

1. Single mutable surface — one hypothesis per iteration, one change per experiment
2. Fixed eval budget — eval runs in bounded time, no network calls in gates
3. One scalar metric — composite score drives keep/discard, not vibes
4. Binary keep/discard — improved = keep, else revert git reset --hard HEAD~1
5. Git-as-memory — every experiment is a commit, discards are reverts, history is the log

Safety rules

• Never modify .lab/ contents during hypothesis implementation
• Never skip eval — every commit must be evaluated before keep/discard
• Always revert on crash — atexit handler restores git state
• Runner uses subscription auth (claude -p with ANTHROPIC_API_KEY stripped)