Nick Vigilante 182bdc871a docs: scaffold docs/.style for the prose style guide (#25466)
Adds a private contributor-tooling directory at `docs/.style/` that will
host the canonical prose style guide and the custom Vale rules used to
enforce it. The directory's contents do not deploy to `coder.com/docs`.

This PR is the scaffold only. The Vale configuration, the rule set, and
the per-rule style-guide sections all land in follow-up PRs.

## What changes

- New `docs/.style/` directory with:
  - `README.md` explaining the convention
  - `style-guide.md` as a table-of-contents scaffold
- `styles/Coder/README.md` placeholder so Git tracks the empty Vale
rules dir
- `.github/workflows/deploy-docs.yaml`: skip the workflow on
`.style`-only pushes, and exclude `.style` paths from the
surgical-reindex git diff on mixed commits. Defense-in-depth on top of
the manifest-driven coder.com routing.
- `.github/.linkspector.yml`: add `docs/.style` to `excludedDirs`
- `AGENTS.md` and `.claude/docs/DOCS_STYLE_GUIDE.md`: cross-link to the
new style guide for agents

## Verification

- `make pre-commit-light` clean (`fmt/markdown`, `lint/markdown`,
`lint/typos`, `lint/emdash`, `lint/actions/actionlint`,
`lint/shellcheck`).
- `markdown-table-formatter --check` and `markdownlint-cli2` both
process the new files (existing globs are `find docs -name '*.md'`).
- `actionlint` clean on the modified workflow.
- coder.com exclusion works because route discovery and Algolia indexing
are manifest-driven; this directory is not in `docs/manifest.json`. The
workflow changes are defense in depth.

<details>
<summary>Implementation plan and decision log</summary>

### Decisions

- **Location**: `docs/.style/` (leading dot, mirrors `.github/`,
`.vscode/`, `.claude/`). Vale's `StylesPath` will be
`docs/.style/styles/`; `.vale.ini` lands at repo root in a follow-up.
- **Existing public page `docs/about/contributing/documentation.md`**:
untouched in this PR. Nick's separate information-architecture rework
will redirect it to GitHub at the right time.
- **Placeholder for empty `styles/Coder/`**: real `README.md`, not
`.gitkeep`. Discoverable on GitHub, lints with the existing tooling,
lists the planned starter rules.
- **CONTRIBUTING.md**: not touched. It's a 2-line redirect to
`coder.com/docs/CONTRIBUTING`; bloating it would defeat the redirect.
- **`.claude/docs/DOCS_STYLE_GUIDE.md`**: kept as the structure/research
companion. A blockquote at the top points at the new canonical prose
guide.

### coder.com exclusion mechanism (verified by inspection)

Direct inspection of `coder/coder.com`:

- Route discovery in
[`src/utils/docs/docs.ts`](https://github.com/coder/coder.com/blob/master/src/utils/docs/docs.ts)
iterates `routes` from `docs/manifest.json`. Files not in the manifest
never become routes.
- The Algolia surgical indexer at
[`src/utils/algoliaDocs/surgical.ts`](https://github.com/coder/coder.com/blob/master/src/utils/algoliaDocs/surgical.ts)
explicitly skips paths not in the manifest, incrementing `pathsSkipped`.

Net result: not adding anything from `docs/.style/` to `manifest.json`
is the only thing that has to be true for the exclusion to work. The
`deploy-docs.yaml` tweaks are defense in depth.

### deploy-docs.yaml changes (pre-mortem)

1. Trigger path negation `!docs/.style/**` skips the workflow on
`.style`-only pushes. GitHub Actions only suppresses when every changed
file matches a negation, so mixed commits still trigger.
2. The git-diff pathspec `:(exclude)docs/.style/**` drops `.style` paths
from the surgical-reindex payload on mixed commits.

Risks considered:

- **Test contract**: `.github/workflows/test-deploy-docs-diff.sh` only
exercises the downstream awk parser, not the git-diff invocation. The
exclusion happens at git-diff time; the parser sees the same
`<status>\0<path>\0` format. No test change needed.
- **First push to a brand-new branch**: the workflow falls back to
whole-branch reindex when `BEFORE_SHA` is all zeros. Whole-branch
reindex re-extracts records from the manifest, which still excludes
`.style` files because they are not in the manifest.
- **Workflow-dispatch**: takes the whole-branch path; same reasoning.
Safe.

### Why a real README in `styles/Coder/` instead of `.gitkeep`

It explains intent, lists the upcoming rules, and lints with the
existing tooling. The cost is one extra Markdown file; the upside is
that a contributor browsing GitHub sees the plan without clicking
around.

</details>

---

*Filed via [Coder Agents](https://coder.com/docs/ai-coder/agents) on
Nick's behalf.*


Linear: DOCS-180
2026-06-17 13:19:37 +00:00
2026-06-16 14:43:54 -06:00

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