ChaosProbe v2 — pre-registration (frozen) + M2 A/A calibration data

Frozen pre-registration deposit for the ChaosProbe v2 study (git tag v2-prereg-freeze, commit 20097c1). Contains the frozen design + pre-registration documents (00-DESIGN, 01-PREREGISTRATION, 02-WORKPLAN, M1A/M1B/M2 reports, DEVIATIONS, FREEZE-DEPOSIT), the two M1b solver-gate artifacts (online-boutique + hotelReservation), the canonical analysis code (m2_aa_analysis.py, aa_block.py), and the raw M2 A/A calibration data (6 same-placement sessions, ~1.8 GB) with a top-level SHA256SUMS. The committed files are reproducible from the git tag; this deposit fixes the immutable reference and the otherwise-gitignored raw A/A data.