Improve migration and command output verbosity

Add migrate:commit reminder after successful migrations in dev mode
Add --silent flag to rsx:clean and use in framework updates
Add minimal README.md with clone instructions

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

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

bin/framework-pull-upstream.sh

@@ -498,7 +498,7 @@ if [ "$NO_REBUILD" = true ]; then
     echo "⚠️  Cleaning caches only (--no-rebuild specified)"
     echo ""
 
-    if ! php artisan rsx:clean; then
+    if ! php artisan rsx:clean --silent; then
         echo "ERROR: Cache clean failed"
         exit 1
     fi
@@ -518,7 +518,7 @@ else
 
     # Step 1: Clean caches
     echo "Step 1/4: Cleaning caches..."
-    if ! php artisan rsx:clean; then
+    if ! php artisan rsx:clean --silent; then
         echo "ERROR: Cache clean failed"
         exit 1
     fi