Docs: PHASE_HISTORY.md v1.10 backfill — 13.42 FIX2 -> 13.46 FIX1

Append-only. +5 phase sections (13.42 FIX2 79d449c, 13.43 0e0d79f,
run_tests.sh tag-drift 02510a2, 13.46 v1.0 1d77702, 13.46 FIX1 ad91e25).
981 -> 1023 tests, 47 -> 52 phase entries, 108 -> 114 features,
307 -> 349 invariance, 50 -> 56 Verified. All prior entries verbatim.

Author: miranov25