chore: bump to v2.28.0 and fix repo URLs

- Bump version to 2.28.0 in plugin.json and marketplace.json
  (CHANGELOG was updated but version numbers were missed)
- Fix all repo URLs from kieranklaassen/* to EveryInc/compound-engineering-plugin
- Update component counts in docs: 28 agents, 24 commands, 15 skills, 1 MCP

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

.claude-plugin/marketplace.json

@@ -11,14 +11,14 @@
   "plugins": [
     {
       "name": "compound-engineering",
-      "description": "AI-powered development tools that get smarter with every use. Make each unit of engineering work easier than the last. Includes 27 specialized agents, 23 commands, and 14 skills.",
-      "version": "2.27.0",
+      "description": "AI-powered development tools that get smarter with every use. Make each unit of engineering work easier than the last. Includes 28 specialized agents, 24 commands, and 15 skills.",
+      "version": "2.28.0",
       "author": {
         "name": "Kieran Klaassen",
         "url": "https://github.com/kieranklaassen",
         "email": "kieran@every.to"
       },
-      "homepage": "https://github.com/kieranklaassen/compound-engineering-plugin",
+      "homepage": "https://github.com/EveryInc/compound-engineering-plugin",
       "tags": ["ai-powered", "compound-engineering", "workflow-automation", "code-review", "quality", "knowledge-management", "image-generation"],
       "source": "./plugins/compound-engineering"
     },
@@ -29,7 +29,7 @@
       "author": {
         "name": "Nityesh Agarwal"
       },
-      "homepage": "https://github.com/kieranklaassen/compound-engineering-plugin",
+      "homepage": "https://github.com/EveryInc/compound-engineering-plugin",
       "tags": ["coding", "programming", "tutorial", "learning", "spaced-repetition", "education"],
       "source": "./plugins/coding-tutor"
     }