21in7 5bad7dd691 refactor(ml): add MLFilter.from_model(), fix validator initial_balance ...

- MLFilter.from_model() classmethod eliminates brittle __new__() private-attribute
  manipulation in backtester walk-forward model injection
- backtest_validator._check_invariants() now accepts cfg and uses cfg.initial_balance
  instead of a hardcoded 1000.0 for the negative-balance invariant check
- backtester.py walk-forward injection block simplified to use the new factory method

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-03-21 18:36:30 +09:00

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