git:20260922.c37a2ec to git:20261015.32580a9

3 added, 0 removed. Audit A to A.

# `setup-docs-lint` — technical reference

This composite action provisions the external tools required by the blocking

documentation linter. Both `Static Health Report` and `Documentation Lint`

must call this action before running `scripts/audit/lint_docs.py`.

## Invariants

- `actions/setup-node` and `actions/cache` remain pinned to full SHAs.

+ - Select exactly Node 24.22.0 LTS; Root's `24.x` engine and native

+ Mermaid11 admission require the same major. Preserve the Source-declared

+ npm serializer and every third-party lock record.

- `setup-node` enables `cache: npm` (CI-FAST-DOCSLINT-NPM-1): the npm

download cache is keyed on the lockfile by the official action; `npm ci`

semantics stay unchanged (deterministic reinstall), only tarball

downloads are skipped.

- Mermaid diagrams are rendered by the real `mmdc` command against a real

`chrome-headless-shell`; missing tools fail closed.

- The resolved Chrome path is exported through `GITHUB_ENV` for later workflow

steps in the caller job.

- Python setup and `uv sync` remain caller responsibilities.

## Verification

- Run `actionlint` after editing this action or either caller.

- The CI `Documentation Lint` and `Static Health Report` jobs are the real

behavioral controls because the hosted-runner cache and `GITHUB_ENV`

propagation are GitHub Actions behavior.