feat: AI integration - pipe protocol, test framework, replay system
AI Session API (src/ai/session.rs):
- GameSession wraps Game with seeded determinism
- init/init_empty, step(n), perform_action, get_state
- get_cell, get_region, get_entities, get_player, count_material
JSON Pipe Protocol (src/ai/protocol.rs):
- --mode pipe: stdin/stdout JSON line protocol
- Commands: init, step, action, get_state, get_view, get_cell,
get_region, get_entities, get_player, count_material, find_material,
record_start/stop, replay_save, run_scenario, quit
Test Framework:
- 27 Rust integration tests (tests/*.rs) covering sand, water, lava,
acid, fire physics + entity movement, damage, ragdoll
- 8 JSON scenarios (scenarios/*.json) runnable via --mode test
- Scenario assertions: cell_is, cell_is_not, no_material_in_region,
material_count_in_region, entity_alive/dead, player_on_ground, etc.
Replay System (src/ai/replay.rs):
- Record all actions + seed for deterministic playback
- ReplayPlayer::play() and play_until_tick() for debugging
- --mode replay --replay-file PATH
Other changes:
- src/lib.rs: library target for integration tests
- Collision: post-constraint collision pass to reduce tunneling
- serde + serde_json dependencies
- All enums use rename_all = snake_case for JSON compatibility
Emil
7f4b1dde5e