docs(rules): manual-verification code steps go in org src blocks

A checklist step that is code the user runs (verification setup, bug repro, walkthrough wiring) now goes in an org src block instead of a list bullet, so the user executes it in place with C-c C-c and reads the result in the buffer rather than copy-pasting. Manual actions, prose context, and Expected lines stay as bullets between the blocks.

I scoped the Steps bullet in the same edit: it had said "one action per item" with the command as a bullet, which the new rule would contradict. It now names manual actions as the bullet case and points code steps at the src block.

From the smoke handoff 2026-06-12, worked out on its manual-verification walkthroughs.

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