fix: add explicit PR creation instructions to dev agent message

Add explicit curl command for creating PRs using Gitea API.
Previously the agent was guessing 'tea issue create' instead of
using the correct API endpoint.

Fixes #223

skills/kugetsu/scripts/kugetsu-session.sh

@@ -287,6 +287,23 @@ Workflow:
 8. Create a branch named fix/issue-$number and implement the fix
 9. Create a PR when the implementation is complete
 
+### Creating PRs
+When creating a PR, use the Gitea API directly with curl:
+
+```bash
+curl -X POST "https://$instance/api/v1/repos/$owner/$repo/pulls" \
+  -H "Authorization: Bearer \$GITEA_TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "title": "Fix issue #$number",
+    "head": "fix/issue-$number",
+    "base": "main",
+    "body": "Closes #$number"
+  }'
+```
+
+Environment variable \$GITEA_TOKEN is available in your environment.
+
 Work directory: $worktree_path"
     
     if [ -n "$user_message" ]; then