- Extract minerals from the latched asteroid at ratePerSec × miningSpeed; each mineral shrinks the rock by 1 px so the beam stays latched to its rim.
- Break rocks that lose ~1/3 of their original size: large ones halve in place (beam keeps mining one half), small ones shatter into pieces that fly home and load the hold.
- Add ship.minerals hold with addMinerals/setMinerals capped at stats.mineralStorage; a full hold ends the run instead of grinding the rock away.
- Persist the hold in save/restore (captureState writes ship.minerals, applyRestore restores it) and keep legacy saves working when the field is absent.
- Play new mining_split sfx on each break and surface split/absorbed/storageFull events as console toasts.
- Expose AsteroidCluster rock surgery (setSize/addRock/removeMember) for runtime splits, and add headless Phaser stub + loader plus a mining test suite covering extraction, halving, shattering, full-hold stop, and the hold API.
