- Implement pushHistory mutation to support pushing telemetry data to Zabbix trapper items.
- Add VERBOSITY and MCP_LOG_* environment variables for controllable request/response logging in both API and MCP server.
- Enhance ZabbixRESTDataSource with better session handling and error logging.
- Update ZabbixHistory datasource to support history push operations.
- Expand documentation with new cookbook recipes and MCP integration guides.
- Add integration tests for history pushing (src/test/history_push*).
- Reorganize documentation, moving technical product info PDF to docs/use-cases/.
- Update GraphQL generated types and VCR templates.
- **Optimization**: Implemented automatic Zabbix parameter optimization by analyzing GraphQL selection sets.
- **ZabbixRequest**: Added optimizeZabbixParams with support for skippable parameters and implied field dependencies (e.g., state -> items).
- **Resolvers**: Updated allHosts, allDevices, allHostGroups, and templates to pass requested fields to data sources.
- **Data Sources**: Optimized ZabbixQueryHostsGenericRequest and ZabbixQueryTemplatesRequest to skip unnecessary Zabbix API calls.
- **Regression Tests**: Enhanced RegressionTestExecutor with new tests for optimization (REG-OPT, REG-OPT-NEG), state retrieval (REG-STATE), dependent items (REG-DEP), and empty results (REG-EMPTY).
- **Documentation**: Created query_optimization.md How-To guide and updated roadmap.md, README.md, and tests.md.
- **Bug Fixes**: Fixed deviceType tag assignment during host import and corrected ZabbixCreateHostRequest to support tags.
