v0.5.1

Changed

• Provenance credits a year of coding agents, most of it in Cursor and the last two months in
  Claude Code, rather than a year in ~/.claude.
• The README and the comparison no longer claim the read-only hook is what stops plan mode
  prompting: Claude Code's own classifier does that by default in auto mode. The hook's value
  is deterministic, no-round-trip approval that also covers Manual mode and API, Bedrock and
  Vertex sessions.