chore(todo): audit solo tags and close shipped tasks

I tagged the open tasks for solo eligibility: solo means the work needs no decision or preference input, only manual validation afterward. I added solo where the work is self-contained and dropped it where a design or palette decision gates it.

I closed the tasks that shipped (eat zoom-out binding, ledger wiring, transcription stderr, EAT diff darkening), filed the ledger guardrail-UX audit, and added the manual-validation checks for the failing-transcription log and the diff darkness.

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