fix(reader): recalibrate for game build 1.00.28 (#109)

Plain reseed. The recompile shifted only the metadata index table —
every tracked TypeDefIndex moved -1 and idx_ut 2829->2828 — while every
offset, enum, and Obscured encoding stayed put. calib_seed.json recaptured
in combat for fp 1.00.28-0x6a571b94-0x698c000; GAME_VERSION -> 1.00.28.

Ship gate green on both halves:
- STATIC preflight exit 0 (ruff + pytest 547 + code<->dump diff, no drift;
  offsets.py untouched).
- LIVE validate_live PASS on ALL 13 metrics (calib/gold/party-live/
  hero-class/save-build/build-record/xp-live/party-slots/dps/stats/stage/
  run-cycle/catalogs). xp-live PASS confirms the 1.00.27 ObscuredDouble XP
  cipher still decodes on this build — no bucket-4 encoding change.

Author: marioalvial