feat(kyberforge): add instructions-author skill for .apm/instructions files

Scaffolds and revises apm instructions files, with a throwaway-package
verification recipe because `apm compile --validate` always exits 0 and
Claude Code drops `description`. Routed from forge and linked from
apm-workflow's compile reference. Bumps kyberforge to 2.1.0 and the catalog
to 0.5.2.

Fixes #148

Co-Authored-By: Claude Code <[email protected]>
Claude-Session: https://claude.ai/code/session_01KkT7RSDwDbmrM9T34b6sTi

.claude-plugin/marketplace.json

@@ -1,7 +1,7 @@
 {
   "name": "holocron",
   "description": "AI development skills for Claude Code, and for GitHub Copilot through apm — factory, design, implement, review, and cross-cutting workflows.",
-  "version": "0.5.1",
+  "version": "0.5.2",
   "owner": {
     "name": "Defame1297",
     "email": "[email protected]",
@@ -11,7 +11,7 @@
     {
       "name": "kyberforge",
       "description": "Skills and agents for creating, maintaining, and managing an apm plugin marketplace for Claude Code and GitHub Copilot.",
-      "version": "2.0.2",
+      "version": "2.1.0",
       "category": "Developer Tools",
       "source": "./plugins/kyberforge"
     },