feat: Clean up codebase and add GitHub Actions workflows

.github/workflows/build-and-publish.yml

@@ -1,10 +1,8 @@
 name: Build and Publish Tools
 
+# DISABLED: Replaced by main-ci.yml and pr-checks.yml
 on:
-  push:
-    branches: [ main, feat/core-tools, feat/llm-standard-library ]
-  pull_request:
-    branches: [ main ]
+  workflow_dispatch:  # Manual trigger only
 
 env:
   REGISTRY: ghcr.io