feat(mcp) : add business tools — search, history, comments, custom fields, documents, model types
- search_inventory: global search across all 6 entity types
- get_entity_history + get_activity_log: audit trail access
- 4 comment tools: list, create, resolve, unresolved count
- 3 custom field tools: list values, upsert, delete
- 2 document tools: list, delete (upload via REST only)
- 6 model type tools: list, get, create, update, delete, sync
- 69 MCP tests pass total
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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