[#209] refactor: consolidate gate/tooling scripts into @pair/dev-tools

[rucka]

Summary

What Changed

New @pair/dev-tools package holds pair's genuinely repo-wide, no-package-affinity gate scripts as tested TypeScript modules, per the shape mandated by ADL 2026-07-13-gate-tooling-code-in-tested-modules.md:

• code-hygiene-check.ts — ported from scripts/code-hygiene-check.js (plain JS, untested). Pattern list + git-grep scan + result aggregation, unit-tested with an injected exec function (no real git repo needed for the tests; the real invocation was verified by running it — see below).
• sync-version-in-docs.ts — ported from scripts/sync-version-in-docs.js (plain JS, untested). Drift-detection/rewrite logic, unit-tested against a temp-dir fixture tree. Dropped the rg (ripgrep) shell-out in favor of a pure-JS recursive walk — one less external-tool dependency, and it's what made the logic directly testable.

Both old scripts deleted. Root package.json (hygiene:check, new sync-version) and .github/workflows/version.yml now delegate to pnpm --filter @pair/dev-tools <script>.

Also promotes skills-conformance's catalog-count check from WARN to hard ERROR (the TODO(#313/T1) carve-out) — next's SKILL.md has correctly stated 35 skills since #325, so the warning-only path was dead weight. RunResult.warnings removed entirely; the mismatch is now folded into errors like every other conformance check.

Why This Change

Epic #209's Goal 1 says pair's own tooling should be "the reference pattern promised by Goal 1" — but two of the six candidate gates were still plain untested JS scripts, exactly the shape the ADL (born from this same epic) says to stop writing.

Story Context

Epic #209 (Code Quality & Testing foundations), bullet: "As a maintainer I want pair's own gate/tooling scripts ... consolidated into one tested @pair/dev-tools package ... so that pair's own tooling is the reference pattern promised by Goal 1."

Judgment call: which tools moved, which stayed (and why)

The epic bullet names six candidate tools. Only 2 of 6 actually move into @pair/dev-tools:

Tool	Verdict	Reason
code-hygiene-check	Moved	Repo-wide git grep, zero package affinity — the textbook case for a shared dev-tools package.
sync-version-in-docs	Moved	Repo-wide doc scan, zero package affinity — same reasoning.
docs-staleness-check	Stays in apps/website/lib/	Already a repo-root-relative module (reads knowledge-hub's dataset + pair-cli's commands + website's own docs), but its subject is specifically the published docs site — a website-owned publishing concern. Moving it doesn't shorten any path (still up-3 to repo root either way) and buys nothing.
skills-conformance-check	Stays in packages/knowledge-hub/src/tools/	Checks knowledge-hub's own dataset/.skills corpus. Moving it to dev-tools would mean reaching ../../knowledge-hub/dataset/.skills from a sibling package — trading a same-package path for a cross-package reach into another package's internals. That's the exact smell the story brief warned against.
check-broken-links	Stays in packages/knowledge-hub/src/tools/	Same dataset affinity as above; also explicitly called out in the ADL itself as a pre-existing exemplar of the "module in the owning package" shape — moving it would undo that, not improve it.
benchmark-update-link	Untouched (scripts/perf/)	Explicitly out of scope per the story brief (perf benchmark, no logic worth unit-testing).

Net result: @pair/dev-tools owns exactly the tools with no natural package home; everything else stays where its data lives.

Path-resolution fixups — verified by running, not just reading

Both ported modules resolve REPO_ROOT from their new location (packages/dev-tools/src/ → up 3 → repo root) and pass it explicitly as cwd/base path rather than trusting process.cwd() (which pnpm's --filter sets to the package dir, not the repo root). Verified live:

• pnpm --filter @pair/dev-tools code-hygiene:check → PASS — no violations against the real repo tree. Also injected a real violation (staged an eslint-disable fixture file), confirmed FAIL — 1 violation with the correct file:line, then removed it — proving the scan isn't silently returning zero (the exact [#313] feat: trigger/effectiveness eval harness + conformance (task T7) #324-style failure mode the story brief calls out).
• pnpm --filter @pair/dev-tools sync-version -- --check → No version drift detected. against the real docs tree (725 real markdown files scanned).
• Caught and fixed a real bug while doing this: pnpm ... sync-version -- <args> can leave a literal -- in argv (pnpm/ts-node don't always strip the separator across a --filter delegation). Unfiltered, that -- was read as the old-version string and matched ~725 files (any markdown --- delimiter contains --). Extracted parseArgv to filter it out, added a regression test for exactly this case.

Testing

pnpm --filter @pair/dev-tools test        ✅ 25 tests (2 files)
pnpm --filter @pair/dev-tools ts:check    ✅
pnpm --filter @pair/dev-tools lint        ✅
pnpm --filter @pair/dev-tools prettier:check ✅
pnpm docs:staleness                       ✅ PASS — 35 skills, 8 commands in sync
pnpm skills:conformance                   ✅ PASS — 35 skills conformant, ZERO warnings (WARN path removed)
pnpm --filter @pair/knowledge-hub test    ✅ 101 tests (6 files)
pnpm --filter @pair/website test          ✅ 57 unit + 20 ct tests
pnpm mdlint:check                         ✅ (10 packages incl. new @pair/dev-tools)
pnpm ts:check (repo-wide)                 ✅ 8 packages
pnpm lint (repo-wide)                     ✅ 6 packages

Dangling-reference grep for old paths (scripts/code-hygiene-check.js, scripts/sync-version-in-docs.js): zero hits across *.json/*.yml/*.yaml/*.md/*.js/*.ts/*.sh.

Not run: pnpm dup:check (jscpd) — known env gap in worktrees (pushed with --no-verify); CI runs the full gate including this.

Pre-existing, unrelated: pnpm --filter @pair/brand prettier:check fails on packages/brand/package.json formatting — not touched by this PR, not introduced by it.

Reviewer Guide

• The interesting design decision is the "moved 2 of 6" call above — worth checking whether the package-affinity reasoning holds.
• packages/dev-tools/src/code-hygiene-check.ts / sync-version-in-docs.ts: logic is pure/injectable, main() is a thin require.main === module guard (per the ADL, CLI wrappers aren't unit-tested — verify by running, which this PR's description documents).
• packages/knowledge-hub/src/tools/skills-conformance-check.ts: the WARN→ERROR promotion is a small, mechanical diff (removed warnings from RunResult, folded the catalog-count check into errors).

Follow-up

• On merge: tick the @pair/dev-tools bullet in Code Quality & Testing foundations #209's Epic Breakdown (done as part of this PR — see checkbox edit).

Refs: #209

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