feat(workflow): Add workflow plugin v1.0.0

Git workflow, code quality, context management and testing commands:
- commit, push, pr, issue - git operations
- simplify, refactor, verify, check - code quality
- catchup, onboard, save, cleanup - context management
- test, format, sync - development utilities

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

.claude-plugin/marketplace.json

@@ -20,6 +20,13 @@
       "description": "Autonomous loop for PRD implementation - context detection, adaptive questions, browser verification",
       "version": "1.2.1",
       "keywords": ["ralph", "prd", "autonomous", "agent", "loop", "browser", "verification"]
+    },
+    {
+      "name": "workflow",
+      "source": "./plugins/workflow",
+      "description": "Git workflow, code quality, context management and testing commands",
+      "version": "1.0.0",
+      "keywords": ["git", "commit", "pr", "issue", "simplify", "verify", "test", "catchup", "context"]
     }
   ]
 }