refactor(scripts): restructure workspace scripts into check:* / test:* families

Replace the opaque `vp check` bundling and the ad-hoc `ready` chain (which
shelled out via `cd ... && pnpm ...`) with explicit, composable named scripts.

Root delegates; category splits live in the package that owns them:

  root: check:fmt / check:lint / check:fixtures / test / build / ready
  runtime-tests: test = test:integration + test:pty; check:fixtures

`ready` now composes the named scripts in dependency order (fmt, lint, build,
fixtures, test) — build runs before check:fixtures and test:pty, which need
the built dist. Drop the broken root `dev` (referenced a non-existent website
package) and the redundant per-package `check` scripts (fmt/lint already run
workspace-wide from root). Renames: pty-test -> test:pty, typecheck:fixtures
-> check:fixtures.

packages/runtime/package.json

@@ -19,7 +19,6 @@
     "build": "vp pack",
     "dev": "vp pack --watch",
     "test": "vp test",
-    "check": "vp check",
     "prepublishOnly": "vp run build"
   },
   "dependencies": {