docs: log Phase 11 M-tier scenarios (cumul=1.988 > E-tier 1.284, discriminability three-tier)

docs: clean BUILD_LOG phases list + point to TRAINING_LOG; cross-ref Section 1 partial data

docs: log Phase 10 HF Space deploy (production step_shaping=0.1000 verified)

docs: log Phase 9 results (discriminability gap 0.348 shaped, env validated)

docs: backfill Phase 8 BUILD_LOG entry + update README status

docs: add TRAINING_LOG.md template + training_logs dir for Phase 13 discipline