chore(kyberforge): bump plugin version to 1.2.3

skill-author and agent-author SKILL.md files received bug fixes (git-log
commit-hash verification before reporting completion, skill-author now
forbids self-spawning audit/recheck subagents during its authoring pass,
and agent-author closed checklist/coverage gaps). Patch bump to reflect
fixed behavior, not new capability.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FNJWdVvdgvZCHi1hZGqgVQ

plugins/kyberforge/plugin.json

@@ -13,5 +13,5 @@
   "skills": [
     "skills/"
   ],
-  "version": "1.2.2"
+  "version": "1.2.3"
 }