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>

app/RSpade/Commands/Migrate/Maint_Migrate.php

@@ -264,11 +264,12 @@ class Maint_Migrate extends Command
 
         $this->info("\nAll tasks completed!");
 
-        // Unlink manifest cache if not in production (triggers fast rebuild)
-        if (app()->environment() !== 'production') {
-            \App\RSpade\Core\Manifest\Manifest::_unlink_cache();
+        // Remind user to commit snapshot in development mode
+        if ($require_snapshot) {
+            $this->newLine();
+            $this->line('Please run <info>php artisan migrate:commit</info> to finish the migration process.');
         }
-        
+
         // Disable query logging
         AppServiceProvider::disable_query_echo();