add DEPLOYMENT_LEARNINGS.md to gitignore

- Keep deployment knowledge base local only
- Prevent committing sensitive troubleshooting information
- Maintain institutional knowledge without exposing internal details

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

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

.gitignore

@@ -1,3 +1,4 @@
 .python-version
 secrets.enc
 vault_pass
+DEPLOYMENT_LEARNINGS.md