build(lint): register @shadcn/lint in both oxlint configs

[suiramdev]

Summary

Registers @shadcn/lint 0.1.1 as an Oxlint JS plugin in both lint configs — the root oxlint.config.ts and apps/fumadocs/.oxlintrc.json — and enables no rule of it. Setup only: the rule choice is a design decision, and upstream's SETUP.md stops at registration. Look at settings.shadcn first; it is the only thing discovery could not work out on its own.

Motivation

• The linter reads the real components, variants and theme, so an error can name the size or token to use instead of just refusing a class.
• Oxlint is already the only linter here and is 1.80.0, exactly the JS-plugin floor, so the plugin costs one dependency and two lines.
• Registering it now separates the plumbing from the rule-by-rule argument, which is worth its own review.
• packages/ui is already in ignorePatterns, which is the correct blast radius: its components are the design system.

Drawbacks

• A plugin with no rule on is inert — it earns nothing until a rule is chosen.
• The plugin prints a notice on every run: this project's cn is 0.2.5 and its grammar wants 0.2.6, so it falls back to its bundled copy. It therefore reasons about class merging with a slightly different grammar than the app runs.
• Two configs now repeat the same two lines; apps/fumadocs does not inherit the root config.
• Third-party JS plugins run in-process on every lint, including CI.

Prior art

• The repository already runs a third-party Oxlint JS plugin, @jliocsar/begone-slop, in exactly this shape.
• Upstream shadcn-ui/lint documents the ESLint and Oxlint setups and explicitly leaves rules off after install.
• The cn bump was left out on purpose: it is a runtime dependency of every component, and this repo has a documented procedure for proving a class-merge version change alters no output.

Notes

• No visual change; no runtime code touched.
• No tests added — the change is configuration; verified by probe instead (below).
• Docs updated: contributing/index.mdx gains the plugin and how to switch a rule on, and packages/ui/AGENTS.md records why the ignore is correct for that package.
• Gates: bun run check clean over 649 files, bun run check-types, bun run docs:check 38 pages / 0 errors / 0 warnings, cd apps/fumadocs && bun run lint exit 0.
• A green run with zero rules proves nothing, so the rules were forced on temporarily through the real configs, then every probe file was deleted: no-restyle quoted Button's real cva ladder (default, compact, icon, icon-compact) and its real path, no-raw-colors listed the real theme tokens, apps/fumadocs resolved against its own src/shared/ui and app.css, and both apps reported 0 warnings — an unresolved alias or theme would have shown up there.
• Follow-up, not blocking: bump cn to 0.2.6 with the class-merge proof, then choose rules.

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