fix(gitea): register gitea-orchestrate agent in plugin manifest

plugins/gitea/agents/gitea-orchestrate.md and .agent.md were fully
written but the plugin manifest never declared an "agents" key, so
the plugin loader had no path to discover/register the agent (unlike
plugins/git and plugins/kyberforge, which both declare "agents":
"agents/"). Bump the patch version in both manifests per plugin-author's
UPDATE flow convention, since consumers cache plugin metadata by version.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VwtxcDXuLZxYzWnT2FaoZU

plugins/gitea/plugin.json

@@ -1,4 +1,5 @@
 {
+  "agents": "agents/",
   "author": {
     "email": "defame1297@rkdr.net",
     "name": "Defame1297"
@@ -19,5 +20,5 @@
   "skills": [
     "skills/"
   ],
-  "version": "1.3.0"
+  "version": "1.3.1"
 }