# T1.4.1 — Add rustdoc on `MiniHeaderV2` / `MiniFrameContextV2` public items

**Status:** Approved
**Agent:** Kimi Code CLI
**Started:** 2026-05-11T07:26Z
**Completed:** 2026-05-11T07:27Z
**Commit:** see git log
**PRD:** ../PRD-wire-format-v2.md

## What I changed

- `crates/wzp-proto/src/packet.rs:641-645` — added `///` doc comments to all 3 fields of `MiniHeaderV2` (`seq_delta`, `timestamp_delta_ms`, `payload_len`)
- `crates/wzp-proto/src/packet.rs:648` — added `///` doc on `WIRE_SIZE`
- `crates/wzp-proto/src/packet.rs:650` — added `///` doc on `write_to`
- `crates/wzp-proto/src/packet.rs:656` — added `///` doc on `read_from`
- `crates/wzp-proto/src/packet.rs:705` — added `///` doc on `MiniFrameContextV2::update`
- `crates/wzp-proto/src/packet.rs:709` — added `///` doc on `MiniFrameContextV2::expand`

## Why these choices

Follow-up from T1.4 review: coding standard #9 requires `///` on all public items. Added concise one-line docs matching the task spec examples.

## Deviations from the task spec

None.

## Verification output

```bash
$ cargo doc -p wzp-proto --no-deps 2>&1 | grep -i "missing" || echo "no missing-doc warnings"
no missing-doc warnings
```

```bash
$ cargo clippy -p wzp-proto --all-targets -- -D warnings -W missing_docs 2>&1 | grep -E "packet.rs:6[4-9][0-9]|packet.rs:7[0-1][0-9]" | head -10
# (no output — no missing-docs in MiniHeaderV2 / MiniFrameContextV2 region)
```

```bash
$ cargo build -p wzp-proto
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.24s
```

```bash
$ cargo test -p wzp-proto --no-fail-fast
running 112 tests
test result: ok. 112 passed; 0 failed; ...
```

```bash
$ cargo fmt --all -- --check
# (clean)
```

## Test summary

- Tests added: 0
- Tests modified: 0
- `cargo clippy -p wzp-proto --all-targets -- -D warnings`: pass
- `cargo fmt --all -- --check`: pass

## Risks / follow-ups

None.

## Reviewer checklist (filled in by reviewer)

- [x] Code matches PRD intent
- [x] Verification output is real (re-run if suspicious) — re-ran the region-scoped clippy grep; zero hits.
- [x] No backward-incompat surprises
- [x] Tests cover the new behavior
- [x] Approved

### Reviewer notes (2026-05-11)

Approved. All 3 fields + 3 `MiniHeaderV2` members + 2 `MiniFrameContextV2` methods carry `///` docs. Both Verify commands run. Closes the rustdoc trilogy (T1.1.1 / T1.2.1 / T1.4.1) — every public item added by Wave 1 v2 wire-format tasks now has documentation.
