fix: typecheck uses -p (non-composite projects)

Projects are non-composite with noEmit, so build mode (-b) re-builds every run.
Use -p for proper project checking: bunx tsc -p server && bunx tsc -p shared && bunx tsc -p web

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

package.json

@@ -3,7 +3,7 @@
   "private": true,
   "workspaces": ["server", "web", "shared"],
   "scripts": {
-    "typecheck": "bunx tsc -b server shared && bunx tsc -p web",
+    "typecheck": "bunx tsc -p server && bunx tsc -p shared && bunx tsc -p web",
     "test": "bun test server",
     "build:web": "bun run --cwd web build"
   },