feat(core,tooling): Windows support — shell selection, install.ps1, win-x64 release package, Windows CI (#79)

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

packages/server/package.json

@@ -25,7 +25,7 @@
     "node": ">=24"
   },
   "scripts": {
-    "dev": "node ../../scripts/dev-prebuild.mjs && PENGUIN_HOME=\"${PENGUIN_HOME:-$HOME/.penguin/dev-data}\" tsx watch src/index.ts",
+    "dev": "node ../../scripts/dev-prebuild.mjs && node ../../scripts/run-with-env.mjs PENGUIN_HOME=~/.penguin/dev-data -- tsx watch src/index.ts",
     "start": "node --disable-warning=ExperimentalWarning dist/index.js",
     "typecheck": "tsc --noEmit -p tsconfig.json",
     "test": "vitest run --passWithNoTests",