chore: write update doc

MEMORY_N8N_UPDATE.md

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+# n8n Update Process - Quick Reference
+
+## Quick Steps to Update n8n
+
+When there's a new n8n version available, follow these steps:
+
+```bash
+# 1. Update n8n dependencies automatically
+npm run update:n8n
+
+# 2. Validate the update
+npm run validate
+
+# 3. Commit and push
+git add -A
+git commit -m "chore: update n8n to vX.X.X
+
+- Updated n8n from X.X.X to X.X.X
+- Updated n8n-core from X.X.X to X.X.X
+- Updated n8n-workflow from X.X.X to X.X.X
+- Updated @n8n/n8n-nodes-langchain from X.X.X to X.X.X
+- Rebuilt node database with XXX nodes
+- All validation tests passing
+
+🤖 Generated with [Claude Code](https://claude.ai/code)
+
+Co-Authored-By: Claude <noreply@anthropic.com>"
+git push origin main
+```
+
+## What the Commands Do
+
+### `npm run update:n8n`
+This single command:
+1. Checks for the latest n8n version
+2. Updates n8n and all its required dependencies (n8n-core, n8n-workflow, @n8n/n8n-nodes-langchain)
+3. Runs `npm install` to update package-lock.json
+4. Automatically rebuilds the node database
+5. Shows you exactly what versions were updated
+
+### `npm run validate`
+- Validates critical nodes (httpRequest, code, slack, agent)
+- Shows database statistics
+- Confirms everything is working correctly
+
+## Important Notes
+
+1. **Always run on main branch** - Make sure you're on main and it's clean
+2. **The update script is smart** - It automatically syncs all n8n dependencies to compatible versions
+3. **Database rebuild is automatic** - The update script handles this for you
+4. **Docker image builds automatically** - Pushing to GitHub triggers the workflow
+
+## Time Estimate
+- Total time: ~3-5 minutes
+- Most time is spent on `npm install` and database rebuild
+- The actual commands take seconds to run
+
+## Troubleshooting
+
+If validation fails:
+1. Check the error message - usually it's a node type reference issue
+2. The update script handles most compatibility issues automatically
+3. If needed, check the GitHub Actions logs for the dependency update workflow
+
+## Alternative: Check First
+To see what would be updated without making changes:
+```bash
+npm run update:n8n:check
+```
+
+This shows you the available updates without modifying anything.