Unify psychophysical kernel timing sources

[rojasgabriel]

Summary

• add fixed-window pooled kernel configs that prefer validated NIDAQ/OneBox events and fall back to Bpod when no visual-event mapping exists
• record nidaq, bpod, or mixed timing provenance on canonical PsychophysicalKernel rows while preserving the migrated legacy fit
• add an idempotent dry-run-first schema migration and focused timing, fit, and migration tests

Test plan

• uvx ruff check .
• uvx ruff format --check .
• MPLCONFIGDIR=/tmp/mpl PYTHONPATH=src .venv/bin/python -m unittest discover -s tests -v
• live read-only Bpod fixed-window fit: 393 trials, 10 bins, score 0.847308
• live read-only NIDAQ fixed-window fit: 291 choices, 91 complete trials, 7 bins, score 0.704444
• live schema migration dry run

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