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>

plugins/workflow/.claude-plugin/plugin.json

@@ -0,0 +1,8 @@
+{
+  "name": "workflow",
+  "description": "Git workflow, code quality, context management and testing commands",
+  "version": "1.0.0",
+  "author": {
+    "name": "Romfast Team"
+  }
+}