v0.6.0 — git-likeness Tier 2 (remotes, reflog, cherry-pick, gc)

Takes mcadiff from a local VCS toward a distributed one — sync world history between repositories (e.g. push backups to another drive/NAS). No network yet; remotes are repository directories, and because objects are content-addressed, transfer copies only what the other side lacks.

New

• Remotes (filesystem): clone, remote add, fetch, push. push is fast-forward-checked (--force overrides); fetch populates refs/remotes/<remote>/* (resolvable as origin/main).
• reflog — HEAD movement history (logged on commit).
• cherry-pick <commit> — apply one commit onto HEAD via the 3-way engine.
• gc — prune objects unreachable from any ref.

Fixes (found via Tier-2 testing)

• Merge dropped a one-sided region: a region present on only one side (including an empty region like a fresh poi/) was lost by the manifest 3-way merge. Region existence is now resolved per-region (added / deleted / delete-modify conflict).
• Nondeterministic classification hardened: a rare transient parse failure during the parallel commit could silently downgrade a valid NBT .dat to an opaque blob, making manifests nondeterministic. Parsing now retries before falling back.

72 tests (was 67): clone+push fast-forward, fetch remote-tracking refs, gc prunes unreachable objects, reflog records commits, merge carries a one-sided/empty region.

Deferred (by design)

A staging index and an in-place conflict-resolution workflow don't map cleanly to whole-world snapshots; network transport (ssh/http) and delta/packfiles remain future work.