docs: mention the eval:json alias in the eval header comment

Commit

karthik-rameshkumar5d ago

Matches the README run block so both places list the same invocations.

Co-Authored-By: Claude Fable 5.1 noreply@anthropic.com Entire-Checkpoint: 01M38ZTDFDNPRB2RM2N06ETBRZ

Checkpoints

Document eval:json Script in README

Claude CodeFable 5.1
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Checkpoint 1