chore: suppress transformers warnings via env var, clean up app.py

chore: suppress beta/gamma and sklearn version warnings

fix: load stage3 tokenizer from stage1a subfolder (stage3/tokenizer.json is incompatible)

fix: use use_fast=False for stage3 tokenizer to bypass tokenizer.json

fix: pin tokenizers>=0.19 to fix stage3 tokenizer.json compatibility

fix: use AutoTokenizer for stage3 to fix tokenizer.json version mismatch

feat: add Longformer pipeline with lazy-load model registry

fix: build model offline from BertConfig + .pt weights

use mental-bert with HF token auth

initial deployment

initial commit