build(docs): migrate to VitePress 2 on Vite 8, drop heap-bump stopgap

Moves @rozie/docs off the lone Vite-5 holdout (VitePress 1.6.4) and onto
VitePress 2.0.0-alpha.17 forced onto the repo's existing vite@8.1.0
(Rolldown/Oxc by default) via a root `vite@^7 -> 8.1.0` override. Oxc
parses the engine module graph in Rust, so the ASTs never enter the V8
heap — eliminating the docs-build OOM at its root and letting us remove
the `NODE_OPTIONS=--max-old-space-size` stopgap (superseding aaa7aee).

Keeps the whole monorepo on a single Vite major. Adds oxc-minify
(VitePress 2 peer). Spike-measured: no V8 OOM at a 4096 cap (vs the 6144
CI failure today), build ~79s, 176 pages, check-anchors 211/0 clean.

Design: docs/superpowers/specs/2026-07-03-vitepress2-vite8-docs-migration-design.md

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Xu1vZqhFLF1u85Qc4a7xWX

Author: serpentblade

docs/package.json

@@ -6,7 +6,7 @@
   "scripts": {
     "gen:usage": "node scripts/gen-usage-pages.mjs",
     "dev": "node scripts/gen-usage-pages.mjs && vitepress dev .",
-    "build": "node scripts/gen-usage-pages.mjs && NODE_OPTIONS=--max-old-space-size=8192 vitepress build . && node scripts/check-anchors.mjs",
+    "build": "node scripts/gen-usage-pages.mjs && vitepress build . && node scripts/check-anchors.mjs",
     "preview": "vitepress preview .",
     "test": "vitest run"
   },
@@ -81,8 +81,9 @@
     "rete-area-plugin": "^2.1.2",
     "rete-connection-plugin": "^2.0.4",
     "rete-render-utils": "^2.0.3",
+    "oxc-minify": "^0.138.0",
     "sortablejs": "^1.15.7",
-    "vitepress": "^1.5.0",
+    "vitepress": "2.0.0-alpha.17",
     "vitest": "^4.1.5",
     "vue": "^3.5.0"
   }

package.json

@@ -41,7 +41,8 @@
   },
   "pnpm": {
     "overrides": {
-      "vite@^8": "8.1.0"
+      "vite@^8": "8.1.0",
+      "vite@^7": "8.1.0"
     },
     "packageExtensions": {
       "@analogjs/vite-plugin-angular": {