chore: one-shot cargo fmt --all + CI fmt-check gate + §七 drift-zero policy#136
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…ift-zero policy Sweep accumulated rustfmt drift in one shot (38 .rs files, 242+/207-). All changes are pure formatting (whitespace, line-wrap, attribute spacing per rustfmt.toml pinned style). Zero functional delta — workspace baseline holds at 1614 pass / 26 host-transient fail (WSL2 inotify; identical count on origin/main pre-fmt). Add `.github/workflows/check.yml` enforcing `cargo fmt --all -- --check` + `cargo clippy -D warnings` on push to main and on PRs. Future PRs fail CI if they introduce new drift. CLAUDE.md §七 rewritten from "drift-tolerant" (don't run cargo fmt; keep drifted files alone) to "drift-zero" (commit-front cargo fmt --all required; CI gates). rustfmt.toml header comment synced. Discovered need: V0.6.5 + V0.6.6 cycles saw 5 subagents burn ~15-20% time each manually reverting rustfmt drift after touching a single file. Root cause = pre-existing accumulated drift. Eliminating root cause via one-shot cleanup + CI gate. No version bump.
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Change
One-shot workspace-wide
cargo fmt --all(38 .rs files, 242+/207-, pure formatting diff) + new.github/workflows/check.yml(fmt + clippy CI gate) + CLAUDE.md §七 policy rewrite from drift-tolerant to drift-zero.rustfmt.tomlheader comment synced.Why
V0.6.5 / V0.6.6 cycles saw 5 subagents each manually revert 12-20 unrelated rustfmt drift files after touching a single .rs file — 15-20% time burn / subagent. Root cause = pre-existing drift accumulated pre-§七-rule. Eliminating at source.
Review
cargo test --workspace: 1614 pass / 26 fail — identical to origin/main pre-fmt run on the same host (failures are WSL2 inotify-host transient, not counted in baseline per CLAUDE.md §一).cargo clippy --workspace --all-targets --locked -- -D warnings: cleancargo fmt --all -- --check: clean (self-verify)Scope
Follow-up
After merge, memory entries advising "don't run cargo fmt" become obsolete — main session updates them to reflect the new drift-zero policy.