Spike: TOON

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https://github.com/toon-format/toon claims increased token efficiency for structured output.

We need to
- Prove substantial token savings on our CLI outputs.
- If proven, plan implementation.

Start by reviewing the CLI's current structured outputs and compare their token usage with TOON output using representative commands. Document whether the savings are substantial and, if they are, produce an implementation plan for the CLI; completion is a measured comparison plus a clear plan.

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