feat(v9): sub-tokenization — [UNK] collisions fixed + namespace probe passes + apiVersion probe added

deploy: v8 mainline (post-cleanup) — renamed v8_model to model, v7 archived

deploy: v8 (MLM+recon, 276K) — atomic-vocab + doc_vec architecture

deploy: v7 — broader output vocab, status keys now predictable

deploy: restructure — Space bundle now sourced from hf-space/ in main repo