Hooks a recorder into the command chokepoint so each run is written to disk as
it plays, ready for playback in Phase 3.
- ReplayRecorder (lib): line-oriented append-friendly file — keyed header
(version, build, seed, config_hash, timestamp), then '---', then tick-tagged
command lines interleaved with "# checksum <tick> <hex>" RNG fingerprints.
Each line is flushed so a crash leaves a valid partial file. Config hash is a
64-bit FNV over the config dir's *.toml files; build tag is __DATE__/__TIME__.
- CommandSerializer (lib): per-command text (length-prefixed variable parts;
ship layouts and splitter filters serialized inline). Reset is a file
boundary, never a stream entry.
- CommandManager owns an optional ReplayRecorder: drain() records each applied
command + a post-apply checksum; a drained Reset rolls to a new file;
recordTickCheckpoint() (called per tick from onFrame) writes a checksum every
30 ticks.
- Random seed generated in main and on restart (std::random_device); Simulation
retains it via getSeed() for the header.
- GameWorldView attaches the recorder at construction (first file + tick-0
checksum); replays land in <data>/replays named <timestamp>_<seed>.replay.
ReplayRecorderTest covers serialization, file well-formedness, file rolling,
and the CommandManager drain->record integration. Full suite green
(346 cases / 3377 assertions); app, tests, and balancing all build.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DUsFgd2Ga6pmLz8giS8WUn
Malte Langkabel
97b6f0d8fd