Add claude-snapshot plugin under Automation DevOps

[adhenawer]

Summary

Adds claude-snapshot under the Automation DevOps section as an external-link entry (the plugin lives in its own repo, installable via /plugin marketplace add adhenawer/claude-snapshot).

What it does

Portable snapshots of your ~/.claude/ setup. Export as a .tar.gz on one machine, apply on another in under two minutes — with \$HOME path normalization, diff-before-apply, and automatic .bak rollback of every overwritten file.

Surface area

• 4 slash commands: /snapshot:export, /snapshot:inspect, /snapshot:diff, /snapshot:apply
• Captures: settings.json, global CLAUDE.md, hooks, plugin manifests, and MCP servers (from ~/.claude.json, mcpServers key only — OAuth tokens excluded)
• Tarball carries a structured manifest with schemaVersion, SHA-256 checksums, and MCP install-method classification (npm/pip/binary/manual)
• Cross-platform Node.js ESM — same code on macOS and Linux
• 57 tests, CI matrix (macOS/Ubuntu × Node 18/20/22), MIT licensed

Happy to vendor a subtree copy under ./plugins/claude-snapshot instead if the project prefers that over external-link entries — let me know.