docs(autonomous): V73 — LaTeX format fix + cleanup (#435)

Cycle V73 achievements:
- Fixed LaTeX brace escaping for StatisticalTable (\textbf, \textit)
- Cleaned up deprecated v6.1 files (-3601 LOC)
- Added AUTONOMOUS_CYCLE_SESSION_REPORT_V67-V73
- Build: PASSING | Tests: PASSING
- Zig 0.15.2 compatible | Code formatted

Scientific Tools V11 added: Ablation, Hyperparameters, Dataset, TikZ.

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

Author: Antigravity Agent