Spike

Use when the user wants to test an idea before committing to a real build: "spike this", "quick prototype", "is this possible", "compare A/B", "before we build".

Do not use when reading docs/code can answer the question, or when the user clearly asked for production implementation.

Loop

1. Question: state the concrete feasibility question.
2. Research: read enough docs/source to choose credible approach.
3. Build: create the smallest runnable artifact that validates or invalidates the idea.
4. Stress: try one edge case or failure mode.
5. Verdict: VALIDATED, PARTIAL, or INVALIDATED.

Output shape