chore: add knip:fix script and document knip in README

Matches the existing :fix pattern (format/format:check,
tailwind:lint/tailwind:fix) and surfaces the unused-code check in
the README scripts reference table.

Author: JonasJesus42

README.md

@@ -68,6 +68,8 @@ This runs the full code-generation pipeline (blocks, schema, sections, loaders,
 | `npm run typecheck`    | `tsc --noEmit` — no code emitted, only type errors               |
 | `npm run format`       | Format `src/**/*.{ts,tsx}` with Prettier                         |
 | `npm run tailwind:fix` | Auto-fix Tailwind class issues                                   |
+| `npm run knip`         | Find unused files, deps, and exports                             |
+| `npm run knip:fix`     | Auto-fix knip issues (removes unused exports)                    |
 | `npm run clean`        | Nuke all caches + reinstall                                      |
 
 ## Deploying

package.json

@@ -20,6 +20,7 @@
     "format": "prettier --write \"src/**/*.{ts,tsx}\"",
     "format:check": "prettier --check \"src/**/*.{ts,tsx}\"",
     "knip": "knip",
+    "knip:fix": "knip --fix",
     "clean": "rm -rf node_modules .cache dist .wrangler/state node_modules/.vite && npm install",
     "tailwind:lint": "tsx scripts/tailwind-lint.ts",
     "tailwind:fix": "tsx scripts/tailwind-lint.ts --fix"