Agent Skills: tt-implement-phase

Tasktracker-native per-phase executor. Runs a SINGLE phase whose scope and sub-tasks live as tasktracker phase + sub-task rows (NOT in a docs/plans/*.md file). Honours active-task discipline (setActiveTask on phase AND on each sub-task as worked), respects the locked phase body (HTTP 422 on description edit — design notes go to sub-tasks), updates sub-task status via tasktracker_updateTaskStatus as work progresses, logs defects/learnings/frictions through tasktracker insights, and delegates code work to subagents when a subagent-dispatch tool is available — otherwise does the work in-context itself (graceful degradation), never stalling. Used by /tt-implement-plan as the per-phase unit of work; can also be invoked directly with a phase task id. Triggers when /tt-implement-plan delegates a phase, or manually with "/tt-implement-phase <phase-task-id>", "tt implement phase", "execute phase (tasktracker)", "/tt-implement-phase". Prefer this over the plain /implement-phase skill whenever a tasktracker MCP is available — /implement-phase will happily edit a phase task description (HTTP 422), miss sub-task status updates, and bury defects in chat narrative instead of insights.