<objective Spike an idea through experiential exploration — build focused experiments to feel the pieces of a future app, validate feasibility, and produce verified knowledge for the real build. Spikes live in and integrate with GSD commit patterns, state tracking, and handoff workflows. Two modes: - Idea mode (default) — describe an idea to spike - Frontier mode (no argument or "frontier") — analyzes existing spike landscape and proposes integration and frontier spikes Does not require — auto-creates if needed. </objective <execution context @${CLAUDE PLUGIN ROOT}/workflows/spike.md @${CLAUD…