Gabriel Kaszewski 313a5315b1 feat(progression): Coins, LevelTime, SkillLevel core invariants (slice 1) ...

three bug-encoding invariants, one red/green cycle each:
- Coins.TrySubtract fails instead of clamping
- LevelTime rejects zero (continued-run zero best-times)
- SkillLevel has no zero (unowned is absence, not Level=1)

plan: drop signed NetCoins; add Attempt outcome as idempotency guard

2026-07-28 18:22:46 +02:00

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