Ln 401 Task Executor

This is a structured worker for executing implementation tasks through a kanban flow (Todo → In Progress → To Review). It enforces KISS/YAGNI principles and includes gate checks like the four question goal articulation and an implementation blueprint phase before any code gets written. The skill integrates with Linear, GitHub, or file based task storage and uses hex-line and hex-graph MCP tools when available for semantic code navigation and edit risk analysis. It maintains detailed todo checklists for each workflow step and handles the full cycle including typechecking, linting, and moving the task to review with a summary comment. Not meant for test tasks, which get routed to a separate executor.