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Audit of the plugin + MCP surface after milestone-as-plan (T3): every path that could still create a kind=plan task or describe the old plan-task model is now aligned with the hard-retire decision. - create_task (MCP + REST POST /api/tasks): reject kind=plan with a message pointing to start_planning. The 'plan' enum value stays valid so legacy plan-tasks remain readable; update paths never touch kind, so they round-trip. - create_task / get_task docstrings: 'plan' dropped from creatable kinds; get_task's rules-augmentation noted as legacy-only (get_milestone for new plans). - skills/writing-plans: rewritten for milestone-as-plan (body = design, steps = child tasks, get_milestone to read back). - skills/using-scribe: "plans live in milestones via start_planning", not kind=plan. - TaskEditorView Kind selector: offers Work/Issue; "Plan (legacy)" shown only when the loaded task is already kind=plan (display round-trip). - test: create_task rejects kind=plan. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>