A refactor without a gate silently regrows, so this is the part that makes the
cap stick. Until now the repo had no root .pre-commit-config.yaml at all --
`git commit` ran zero hooks, and the five subproject configs only covered their
own directories.
Adds a root config wiring scripts/check_file_length.sh as a local hook, and
carries the same hook in each of the five subproject configs so committing
with one of those is gated too. Staged files only, so an unrelated commit
never breaks on a violation it did not introduce; exit 1, not a warning; no
baseline and no allowlist, since those are suppressions.
Verified in a throwaway worktree, both directions:
- a staged 261-line file fails the commit (exit 1, HEAD unchanged, no
commit object created)
- a staged 200-line file commits normally (exit 0)
The 44 files still over the cap cannot block this: the hook only ever sees
what a commit touches.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CFSGeWxHPY5rHUGrPqhcmG
Matches the Phase 1 design_system pattern the brief points at: own lint config,
own tests, own coverage gate enforced in CI.
The lint script was declared but unrunnable -- there was no eslint flat config,
and the build tsconfig excludes tests (correctly; they must not ship in dist/),
so type-aware linting had no project for them. Adds eslint.config.js and a
lint-only tsconfig that widens the include without emitting. Running it surfaced
one real defect: nth() interpolated a number into a template literal without
String(), which the consumers' configs would have flagged.
The gate also checks that the committed dist/ matches a fresh build. This is not
theoretical -- the check caught the stale dist/ produced by that very String()
fix on its first run. A stale dist/ in a tag ships old code to every consumer
with no error anywhere, which is the one failure mode this packaging choice
introduces. dist/ is excluded from the whitespace hooks: they would "fix"
generated output that the next build immediately reverts.
CI additionally re-runs the categorical ramp's constraint proof, so the palette
cannot regress silently either.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01U4Rj3s7K2qzrLNgJqqPhno
