T1.1.1: Add rustdoc on MediaHeaderV2 fields

docs/PRD/reports/T1.1.1-report.md

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+# T1.1.1 — Add rustdoc on `MediaHeaderV2` fields
+
+**Status:** Pending Review
+**Agent:** Kimi Code CLI
+**Started:** 2026-05-11T07:17Z
+**Completed:** 2026-05-11T07:18Z
+**Commit:** see git log
+**PRD:** ../PRD-wire-format-v2.md
+
+## What I changed
+
+- `crates/wzp-proto/src/packet.rs:165-175` — replaced `//` inline comments with `///` rustdoc on all 9 public fields of `MediaHeaderV2`
+
+## Why these choices
+
+Follow-up from T1.1 review: coding standard #9 requires `///` on public struct fields. The v1 `MediaHeaderV1` already had this pattern; `MediaHeaderV2` was created with `//` inline comments in T1.1. This follow-up brings it into compliance.
+
+## 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 build -p wzp-proto
+    Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.17s
+```
+
+```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)
+
+- [ ] Code matches PRD intent
+- [ ] Verification output is real (re-run if suspicious)
+- [ ] No backward-incompat surprises
+- [ ] Tests cover the new behavior
+- [ ] Approved