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Verified via FW_DEBUG=1 + systematic param-name probing that the correct parameter is `taskCategoryId` with value = full metaId from get_categories (e.g. taskCategory/23431854_200). Numeric systemCategoryId alone causes API error; full metaId is accepted and stored. Changes: - create_task: add optional category_id parameter → sent as taskCategoryId - update_task: add optional category_id parameter → sent as taskCategoryId; guard now accepts category_id-only updates - get_tasks: expose category_id field in returned task objects - get_categories: update docstring (param name now known) - SPEC.md: document verified taskCategoryId param + clarify categories[] vs taskCategoryId field distinction - scripts/find_category_param.py: discovery script used to find param name Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>