Each loop iteration: pick the first unchecked item, implement it with tests, run the gated checks, commit with `oxy`, tick the box here with a one-line note, and commit again. Update `docs/spec.md` (and its changelog) whenever behaviour the spec describes changes. If an item cannot be finished in two iterations, note why under it and move on.
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##Rules
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-Never run `git init` in this directory or push this project anywhere. Oxygen tracks itself with `target/release/oxy`.
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- Never modify `~/development/tetriblox`; use only mirror clones in the scratch directory.
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- Tests must stay hermetic (`hermetic()` / `OXY_HOME`); never touch `~/.config/oxy`.
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- Gate every commit on `cargo test --workspace` exit status and a clean `cargo clippy --workspace --all-targets`.
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- No new external services, no publishing, no artifacts.
-[x] Checkpoints (spec §11) — done 2026-09-27 00:05. At 5,002 changes: status 0.10 s → 0.03 s, commit 0.20 s → 0.05 s; checkpoint write 0.10 s, payload 1.7 MB; states now hold change metadata only. serialize a `State` to a checkpoint object, load the nearest checkpoint in `load_state` and replay only the difference, create one automatically every `core.checkpoint-interval` changes (default 256) and on demand (`oxy checkpoint`). Benchmark before/after on a 5,000-change synthetic repository and record the numbers here.
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- [x] Pack merging (spec §13.4) — done 2026-09-27 00:05; folds packs into one above 16, also after auto-pack. merge packs when more than 16 exist; `oxy gc` reports it.
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- [x] Modern CLI presentation (user request, 2026-09-26 23:20) — done 2026-09-27 00:05 via `src/cli/ui.rs` (console + indicatif): colour, spinners on long commands, `--plain`, NO_COLOR and non-TTY detection; status/log/show/commit/checkout/verify/sync/gc restyled. colour and bold for ids, paths, and statuses; a live spinner or updating status line while a command works (snapshot, fetch, push, import, gc); indented, grouped output like Claude Code's. Use `console`/`indicatif` or equivalent; detect a TTY and honour `NO_COLOR` and `--no-color`/`--plain` so pipes and scripts get plain text; keep `--json` where it exists. Touch every command's output for consistency.
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- [x] Shell prompt integration (user request, 2026-09-26 23:30) — done 2026-09-27 00:05: `oxy prompt [--format]`, manifest-based dirty check (<10 ms), ahead/behind from tracking, `docs/prompt.md` with bash/oh-my-bash/zsh snippets. `oxy prompt` prints a compact one-line summary for shell prompts in a few milliseconds and with no side effects (no snapshot operation recorded, no locks): bookmark, working-copy ChangeId prefix, head count, a dirty marker (compare the file system against the working copy cheaply: sizes and mtimes first, content only when they differ), conflict marker, and ahead/behind counts against `remotes/origin/<bookmark>` when known. Provide `docs/prompt.md` with an oh-my-bash/bash snippet (`oxy_prompt_info` function, silent outside an oxy repository, colours via `--plain` off) and a zsh variant. Format flags: `--format` with placeholders, `--plain`.
- [x] Lazy blobs and the `objects` endpoint — done 2026-09-27 00:45: `clone --max-blob`, `filter.max-blob`, `.oxy/lazy/<ref>` registry, fetch on first read (checkout, export), server `objects` route; status/commit need no blobs. (spec §13.5, §16.1, §17): `clone --max-blob SIZE`, absent blobs recorded with their remote, fetched on first read; server endpoint; wire encoding in spec §16.3.
- [x] Tags (spec §10.1, §14.4) — done 2026-09-27 02:25: `oxy tag create|list`, checkout by tag, tag attestations, tags in views/refs/push, refused when existing with another state, policy rule `tags/<name>`, Git export as tags. `oxy tag create|list`, tag attestations, tags in views, wire, and export.
- [ ] Rename detection on Git import (similarity ≥ 50%); `oxy git fetch`/`push` against a Git remote via a mirror.
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- [ ] Hardening: property tests for the CBOR decoder and pack reader against random and mutated inputs; a concurrent-push test against the server; a 1 GB single-file benchmark for chunking and blobs.
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- [ ] Documentation: `docs/guide.md` (user guide by task) and `docs/protocol.md` (for other implementers, derived from spec §16 and the wire encodings).
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- [ ] Spec review pass: resolve or re-word every "MAY ... until" allowance introduced during implementation, and close what can be closed in §27.