Rename build:watch to build:watch:packages

Only watches and builds packages in ./packages/*, excluding apps.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

devenv.nix

@@ -16,6 +16,6 @@
 
   processes = {
     dev.exec = "bun run dev";
-    build-watch.exec = "bun run build:watch";
+    build-watch.exec = "bun run build:watch:packages";
   };
 }

package.json

@@ -8,7 +8,7 @@
   "scripts": {
     "dev": "turbo dev",
     "build": "turbo build",
-    "build:watch": "turbo build --watch",
+    "build:watch:packages": "turbo build --watch --filter=./packages/*",
     "lint": "biome check",
     "lint:fix": "biome check --write --unsafe",
     "typecheck": "turbo typecheck",