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description: Plan a new StemeDB milestone
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I need to plan a new milestone for StemeDB. Use the `stemedb-planner` agent.

**Steps:**
1.  **Context**: Read `stemedb/roadmap.md` and `stemedb/architecture.md`.
2.  **Goal**: Ask the user which Milestone/Phase to plan.
3.  **Structure**: Create the directory structure: `mkdir -p stemedb/roadmap/milestone-N/{...}`.
4.  **Tasks**: Generate task definitions.

**Focus**:
- Ensure strict adherence to the "Spine -> Lattice -> Cortex" progression.
- Prioritize **Traits** and **Types** before **Impls**.
