refactor: major cleanup of legacy and temporary files
- Removed ~965MB of temporary directories (temp/, extracted-nodes/, etc) - Deleted outdated database files and backups (.bak files) - Removed legacy shell scripts (mcp-server-v20.sh, rebuild-v20.sh) - Cleaned up orphan test files and debugging scripts - Removed duplicate schema file (src/db/schema.sql) - Deleted old Dockerfile.old and empty database files - Updated documentation structure in README.md - Added n8n_diagnostic tool to documentation - Condensed version history in CLAUDE.md - Created release notes for v2.7.0 Total impact: Removed 34 files, saving ~965MB+ of disk space 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
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