Layout

src/ver_validator/
  issues.py             issue models, code registry, status, pointer + safe-access helpers
  schema_source.py      schema discovery/loading and the format checker
  schemas/<version>/    byte-identical fallback copies of the published schemas
  schema_stage.py       stages 1-2: parse, size (VER104/VER105/VER106), structure, formats
  levels.py             stage 3: level inference and level gates
  spaces.py             stages 4-5: descriptors, bundle and descriptor digests, references
  vectors.py            stages 6 and 14: dim/dtype reconciliation, carriage, checksums
  roles.py              stage 7: role/kind agreement, fusion recipes
  digests.py            stage 8: perceptual digest widths; the shared JCS digest helper
  metadata_rules.py     stages 9-11: basis, raw-segment ordinals, redaction, conflict, trust
  provenance_rules.py   stages 12-13: C2PA state, chronology, action-token registry
  signature_stage.py    stage 15: signature object and detached JWS verification
  lineage_rules.py      stage 16: lineage parents, digests and cycles (1.1-draft only)
  validator.py          orchestrator and report assembly
  cli.py                ver-validate