feat: update descriptions to lead with OpenAgents Control

Changes:
- Lead with 'OpenAgents Control' brand name
- Focus on main features: code review, testing, documentation, task management
- Remove cross-platform mentions (OpenCode, Cursor, Windsurf)
- Emphasize core capabilities:
  - Intelligent code review with security analysis
  - TDD test generation
  - Automated documentation
  - Smart task breakdown
  - Context-aware agents
  - Team standards enforcement

Descriptions now highlight what the tool does rather than where it runs.

.claude-plugin/marketplace.json

@@ -1,6 +1,6 @@
 {
   "name": "oac-marketplace",
-  "description": "AI-powered development workflow automation - code review, testing, documentation, and task management for Claude Code",
+  "description": "OpenAgents Control - Multi-agent orchestration for intelligent code review, automated testing, documentation generation, and task management",
   "owner": {
     "name": "darrenhinde",
     "url": "https://github.com/darrenhinde/OpenAgentsControl"
@@ -9,7 +9,7 @@
     {
       "name": "oac",
       "source": "./claude-plugin",
-      "description": "Ship faster with AI-powered development workflows. Automates code review, test generation, documentation, and task breakdown. Context-aware agents understand your codebase and enforce your team's standards. Works seamlessly with OpenCode, Cursor, and Windsurf.",
+      "description": "OpenAgents Control - Intelligent code review with security analysis, TDD test generation, automated documentation, and smart task breakdown. Context-aware agents understand your codebase and enforce your team's standards.",
       "version": "1.0.0",
       "author": {
         "name": "darrenhinde",

claude-plugin/.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "oac",
-  "description": "AI development workflow automation for Claude Code - intelligent code review, TDD test generation, automated documentation, and smart task breakdown",
+  "description": "OpenAgents Control - Intelligent code review, TDD test generation, automated documentation, and smart task breakdown with context-aware AI agents",
   "version": "1.0.0",
   "author": {
     "name": "darrenhinde",