halo-record 0.2.4

Authority snapshots — records can now carry a privacy-safe snapshot of the rules, skills, and tool registry that governed a run (hashes and refs, never content), sealed into the chain, with automatic dedup across consecutive records. Contributed by @caioribeiroclw-pixel (#4, #5) — this project's first external contributions.

halo export — date-bounded, workpaper-ready evidence export: a CSV of one row per record plus a manifest tying the export to the chain head. Refuses to run on a chain that fails verification.

Also: CI on every pull request, and contribution guidelines in CONTRIBUTING.md.