Adds the real-vite e2e coverage: `vite_build_cache` exercises
runner-aware cache behaviour through `vite build` against the
companion vite PR (NODE_ENV-change invalidation, `envPrefix`-driven
tracked-env set, `dist/` write restoration on cache hit), and
`vite_dev_disable_cache` verifies `disableCache()` short-circuits
the dev server's run from the cache.

Wires the rest of the consumer-side bits needed for vite (consumed
via the `github:` spec for vite-task-client) to install cleanly:

- Adds `vite: catalog:` to `packages/tools/package.json` so
  `pnpm install` materialises `packages/tools/node_modules/.bin/vite`
  for the harness's `link_tools_packages(stage, ["vite"])` symlink
  setup.
- Pins root `packageManager` to `pnpm@10.33.4` matching the vite
  PR's pnpm, removing a per-install version switch that produced
  an outer-vs-inner lockfile-settings mismatch when vite consumed
  vite-task as a git dep.
- Drops the root `prepare: husky` so pnpm's git-dep flow doesn't
  invoke `pnpm pack`, which had been producing a lockfile
  `resolution` entry without the `path:` field — pnpm then
  extracted the *entire* vite-task monorepo into
  `node_modules/@voidzero-dev/vite-task-client/` instead of the
  subpath.
- Pins the vite catalog entry to a commit-specific `pkg.pr.new`
  URL so future bumps require updating this line.
- Sets `blockExoticSubdeps: false` so pnpm 11 doesn't reject the
  transitive `github:` spec.

Refreshes the playground to use the published vite + the runner-
aware tools.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>