chore: remove agent temporary files from git tracking

Add .agents.json.tmp-* pattern to gitignore and remove 82 temporary
agent files that were accidentally committed. These files are runtime
artifacts that should not be tracked in version control.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.gitignore

@@ -46,3 +46,5 @@ coverage/
 
 # Runtime agent data
 packages/server/agents.json
+packages/server/agents.json.temporary
+packages/server/.agents.json.tmp-*