fix(schema): reject available_at earlier than generated_at - #50
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Keep delayed-release semantics while preventing backdated available_at from rewriting earlier overlay replay NAV; clamp with max() as defense.
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Summary
available_at >= generated_at(aware UTC) when present.signal_available_atclamps withmax(generated_at, available_at)so backdating cannot rewrite earlier NAV.Test plan
python3 -m pytest -q -p no:cacheprovider tests/test_overlay_backtest.py tests/test_signal_validation.pyMade with Cursor