Update VALIDATION.md test file paths to use tests/test_pipeline/
instead of tests/unit/ to match PLAN.md definitions.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add Nyquist validation contract for Phase 1 Foundation.
Covers test infrastructure, sampling rate, and per-task verification map.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>