chore: LLM lane probe

fix: DICOM-aware vision prep with fallback degradation

chore: diagnostics (app/ml/imaging/real.py)

chore: diagnostics (scripts/bootstrap_assets.py)

fix: magic-byte asset validation and hub repair

fix: seed skips in-place DICOM rewrite (scripts/seed.py)

fix: seed skips in-place DICOM rewrite (app/services/dicom_preview.py)

fix: LFS pointer bootstrap (Dockerfile)

fix: LFS pointer bootstrap (scripts/bootstrap_assets.py)

fix: restore demo assets via xet-backed storage

fix: drop small binaries from LFS patterns

fix: read preamble-less DICOM rewrites

feat: ClaimFlow API demo backend

initial commit