Typed classification of every piece of training state by reset
lifecycle: FoldReset, WindowReset, SoftReset(decay_bars),
TrainingPersist, SchemaContract.
Replaces the previous vibes-driven fold-boundary reset logic with an
explicit registry. Adding new state requires adding an entry in the
same commit (Invariant 2 Wire-It-Up).
Consumer wiring (reset_fold_state, reset_window_state helpers that
iterate the registry) follows in Task 3 of Plan 1.
Tests: 3 unit tests covering category lookup, fold-reset filtering,
unknown-name handling.
Authority: docs/superpowers/specs/2026-04-24-dqn-v2-unified-design.md §4.A.1
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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