chore(lint): replace markdownlint-cli with rumdl

.claude/skills/holistic-linting/PROJECT-CONFIG.md

@@ -14,7 +14,7 @@ This project uses **Oxlint + Oxfmt, via Vite+ (`vp`)** exclusively for linting a
 | Config File          | Tools                                                                           |
 | -------------------- | ------------------------------------------------------------------------------- |
 | `vite.config.ts`     | Oxlint (lint) + Oxfmt (format), via `vp` — `fmt`/`lint`/`check`/`staged` blocks |
-| `.markdownlint.json` | markdownlint                                                                    |
+| `.rumdl.toml`        | rumdl                                                                           |
 | `.husky/`            | Husky git hooks                                                                 |
 
 ## Running Formatters and Linters

.claude/skills/holistic-linting/SKILL.md

@@ -278,6 +278,7 @@ Linter detection is handled automatically by scanning project configuration file
 | `vite.config.ts`               | Oxlint (lint, type-aware) + Oxfmt (format) via Vite+'s `vp` CLI — `fmt`/`lint`/`check`/`staged` blocks |
 | `tsconfig.json`                | TypeScript compiler                                                                                    |
 | `package.json`, `.prettierrc*` | Prettier                                                                                               |
+| `.rumdl.toml`                  | rumdl                                                                                                  |
 | `.markdownlint.json/.yaml`     | markdownlint                                                                                           |
 | `.shellcheckrc`                | ShellCheck (shell scripts)                                                                             |
 
@@ -950,7 +951,7 @@ Sub-agent resolution:
 ## Troubleshooting
 
 **Problem**: "I don't know which linters this project uses"
-**Solution**: Linters are detected automatically by scanning config files (vite.config.ts, tsconfig.json, package.json, etc.). Check the Linter Detection section for supported tools. This project uses Oxlint (via Vite+'s `vp` CLI) for TypeScript and markdownlint for markdown.
+**Solution**: Linters are detected automatically by scanning config files (vite.config.ts, tsconfig.json, package.json, etc.). Check the Linter Detection section for supported tools. This project uses Oxlint (via Vite+'s `vp` CLI) for TypeScript and rumdl for Markdown.
 
 **Problem**: "Linting errors but I don't understand the rule"
 **Solution**: Look up the rule at https://oxc.rs/docs/guide/usage/linter/rules.html for Oxlint rules, or https://typescript.tv/errors/ for TypeScript errors.

.github/workflows/push_code_linting.yml

@@ -55,6 +55,8 @@ jobs:
       - name: Run Oxlint
         run: vp lint --format github --type-aware --type-check ./src/ ./__tests__/
 
-      - uses: xt0rted/markdownlint-problem-matcher@v3.0.0
-      - run: npm run lint:markdown
+      - name: Run rumdl
+        run: npm run lint:markdown
+        env:
+          RUMDL_OUTPUT_FORMAT: github
         continue-on-error: true

.gitignore

@@ -112,3 +112,4 @@ typings/
 .tern-port
 .yarn/cache
 .vitest/
+.rumdl_cache/

.rumdl.toml

@@ -0,0 +1,29 @@
+[global]
+enable = [
+  "MD001", "MD011", "MD018", "MD022", "MD025", "MD026", "MD028", "MD030",
+  "MD033", "MD036", "MD037", "MD038", "MD039", "MD040", "MD042", "MD045",
+  "MD046", "MD048",
+]
+include = ["**/*.md"]
+exclude = [
+  "**/node_modules/**",
+  "**/CHANGELOG.md",
+  "tests/integration/fixtures/markdown/**",
+  "**/.*",
+  "**/.*/**",
+]
+respect-gitignore = false
+
+[MD026]
+punctuation = ".,;:!。，；：！？"
+
+[MD033]
+allowed-elements = [
+  "a", "img", "br", "sup", "h1", "p", "details", "summary", "code", "div", "b",
+]
+
+[MD046]
+style = "fenced"
+
+[MD048]
+style = "backtick"

AGENTS.md

@@ -28,7 +28,7 @@ every change made here:
 
 - CLI + GitHub Action. Syncs README.md from action.yml (title, description, inputs, outputs, usage, badges).
 - TypeScript, Node `>=24.19.0 <30.0.0` (`package.json` `engines`).
-- Build: `vp pack` (tsdown, via Vite+). Test: `vp test` (Vitest, via Vite+). Lint/format: Oxlint + Oxfmt via Vite+'s `vp` CLI, plus markdownlint.
+- Build: `vp pack` (tsdown, via Vite+). Test: `vp test` (Vitest, via Vite+). Lint/format: Oxlint + Oxfmt via Vite+'s `vp` CLI, plus rumdl.
 - `semantic-release` and publishing sit outside Vite+ deliberately — leave them there.
 - Volta pins the dev version — check `.node-version`.
 
@@ -53,7 +53,7 @@ npm run test               # vp test (Vitest), __tests__/**/*.test.ts
 npm run coverage         # vp test --coverage -> ./out/
 npm run format            # vp fmt --write ./src ./__tests__
 npm run check              # vp check ./src/ ./__tests__/ - CI's actual gate, no side effects
-npm run lint:markdown  # markdownlint
+npm run lint:markdown  # rumdl
 npm run generate-docs  # regenerate README.md from action.yml
 ```
 
@@ -129,8 +129,7 @@ current step list.
   - On `push` only, also invokes `deploy.yml`.
 - **`push_code_linting.yml`** ("Code Linting Annotation")
   - Same bootstrap order as `test.yml`: `npm install` then `voidzero-dev/setup-vp`.
-  - `vp lint --format github` and a markdownlint problem-matcher post inline PR
-    annotations natively — no reviewdog involved.
+  - `vp lint --format github` and `RUMDL_OUTPUT_FORMAT=github npm run lint:markdown` post inline PR annotations natively.
 - **`deploy.yml`** ("NPM Release Workflow")
   - Not push-triggered directly: `workflow_call` (from `test.yml`) + `repository_dispatch`.
   - Runs `npm ci` → engine/signature checks → bootstraps `vp` → build → commit dist/ → `semantic-release`.
@@ -155,6 +154,7 @@ is repo housekeeping (stale bot, assignment, tag cleanup, version updater).
 | `action.yml`     | Action metadata — all inputs/outputs                                                                             |
 | `.ghadocs.json`  | generate-docs config                                                                                             |
 | `vite.config.ts` | Oxlint/Oxfmt rules, pre-commit staged-file config, `pack` (tsdown build), `test` (Vitest) — via Vite+'s `vp` CLI |
+| `.rumdl.toml`    | Markdown lint rules and file exclusions                                                                          |
 | `package.json`   | Deps, scripts, engines, volta                                                                                    |
 
 ## Pitfalls