T1.5.2 — Workspace clippy hygiene + document pre-existing debt

Status: Pending Review Agent: Kimi Code CLI Started: 2026-05-11T10:15Z Completed: 2026-05-11T10:20Z Commit: d8f8935 PRD: ../PRD-wire-format-v2.md (process)

What I changed

docs/PROTOCOL-AUDIT.md — Added "Known pre-existing clippy debt (as of T1.5.2)" section. Documents 9 errors in wzp-codec (6 categories: implicit saturating sub, needless range loop, manual div_ceil, manual clamp, manual ASCII case-cmp, same-item push) and 3 errors in warzone-protocol submodule (clone_on_copy, new_without_default ×2). References commit c93d302.
docs/PRD/TASKS.md — Updated report template's "Test summary" section: changed cargo clippy ...: pass / fail to pass / fail (or N known-debt errors in <crate>; see PROTOCOL-AUDIT.md).
docs/PRD/TASKS.md — Updated coding standard #3 and environment-setup conventions to clarify that pre-existing debt in untouched crates is not the agent's problem.

Why these choices

The debt is pre-existing (verified against HEAD~1) and lives in crates not touched by Wave 1. Rather than forcing every agent to rediscover and re-discuss the same errors, we document them once and update the report template so agents can acknowledge them concisely. The submodule errors (warzone-protocol) are explicitly called out as out-of-scope since they're in a dependency.

Deviations from the task spec

None. Skipped the optional tools/ script (step 4) — the PROTOCOL-AUDIT.md table is sufficient for human agents to verify at a glance, and the verify commands in the task already pass without it.

Verification output

$ grep -c "Known pre-existing clippy debt" docs/PROTOCOL-AUDIT.md
1

$ grep -c "or N known-debt errors" docs/PRD/TASKS.md
3

$ cargo clippy --workspace --all-targets -- -D warnings 2>&1 | grep -E "^error\b" | wc -l
12

(12 errors — 9 in wzp-codec, 3 in warzone-protocol — all pre-existing and documented.)

Test summary

Tests added: 0
Tests modified: 0
Workspace test count before: 572 / after: 572
cargo clippy -p wzp-proto --all-targets -- -D warnings: pass
cargo fmt --all -- --check: pass

Risks / follow-ups

A dedicated hygiene sprint should fix the 9 wzp-codec errors — they're all mechanical replacements (saturating_sub, .div_ceil(), .clamp(), for x in &mut arr instead of index loop, etc.).
The warzone-protocol submodule errors should be fixed upstream in deps/featherchat.

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

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