Phase P1 of the playtest harness design spec:
* tools/playtest/run_playtest.py — replays a playtest YAML
against the Runtime 3 IR and compares to (or updates) a
snapshot JSON
* game/scenarios/playtests/zacus_v3_60min_tech.playtest.yaml
— first canonical playtest, resolves PUZZLE_LA_440 via the
UNLOCK_LA_440 unlock event
* game/scenarios/playtests/snapshots/
zacus_v3_60min_tech.snapshot.json — committed reference
* Makefile: new "playtest" target wiring the runner via uv
Critical-asserts evaluator and TS runner are out of P1 scope.
L'électron rare
7a6e2d0e89