chore(release): bump the holocron catalog to 0.5.0 for the removed entry

Removing the mattpocock-skills entry is a minor catalog change under
apm-workflow's marketplace policy, not a patch. Also describe Copilot
support as reached through apm rather than a native Copilot CLI
marketplace (ADR-0024), and rebuild marketplace.json with apm pack.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

.claude-plugin/marketplace.json

@@ -1,7 +1,7 @@
 {
   "name": "holocron",
-  "description": "AI development skills for Claude Code and GitHub Copilot CLI — factory, design, implement, review, and cross-cutting workflows.",
-  "version": "0.4.7",
+  "description": "AI development skills for Claude Code, and for GitHub Copilot through apm — factory, design, implement, review, and cross-cutting workflows.",
+  "version": "0.5.0",
   "owner": {
     "name": "Defame1297",
     "email": "defame1297@rkdr.net",
@@ -10,7 +10,7 @@
   "plugins": [
     {
       "name": "kyberforge",
-      "description": "Skills and agents for creating, maintaining, and managing a Claude Code / Copilot CLI plugin marketplace.",
+      "description": "Skills and agents for creating, maintaining, and managing an apm plugin marketplace for Claude Code and GitHub Copilot.",
       "version": "2.0.0",
       "category": "Developer Tools",
       "source": "./plugins/kyberforge"