refactor: consolidate pure 32L Dense architecture, purge MoE files, audit hardening

Audit fix: Update tokenizer/configs/tokenizer_config.json for ViuMini-Dense-360M

Audit fix: Update tokenizer/configs/tokenizer_config.yaml for ViuMini-Dense-360M

fix: DDP auto_tune probe-before-wrap + broadcast micro/accum, R0-only logs, empty-shard guard, safety import path

remove v1 tokenizer (stale, mask typo) — use v2 from dataset repo tokenizer/tokenizer.json

sync local: enforce_mix sampler, tokenizer v2 (mask fix + 35/30/35), mix optional docs, repair scripts

FINAL 48k tokenizer (47756, unk0)

docs: rename + push log

init: 28L MoE 241M audit-fixed, smoke pass