Update Dockerfile

Merge pull request #5 from Kattine/polish-product-ux

Polish: concept top-2 calibration, cross-cutting tag, uncertainty flag, overall depth bar

Fix: read MODEL_REPO env var for classifier path

Fix Space frontmatter: valid emoji and shorter description

Deploy: Dockerfile, slim requirements, Space config

Merge pull request #4 from Kattine/phase-8-toggle-and-polish

Phase 8: provider toggle, layout fix, markdown rendering

Update .env.example

Merge pull request #3 from Kattine/phase-4b-distilbert

Phase 4b: DistilBERT in-domain 0.952, OOD 0.916, degradation halved vs LogReg

Merge pull request #2 from Kattine/phase-4a-classical-models

Phase 4a: classical models, ladder 0.167/0.636/0.928

Merge pull request #1 from Kattine/phase-2-dedup-and-splits

Phase 2: dedup and stratified splits, near-dup rate 0.4%

Phase 0-1: project scaffold and data procession