Expand description
A stable text rendering of a clap tree.
Two guards read this. A golden snapshot in crates/cli pins the contract
humans already type, so a refactor that re-spells a flag fails rather than
ships. A drift check pins the agent-facing tree to the same rendering, so
the two surfaces cannot diverge without a test saying so.
The format is for diffing, not for reading: one line per argument, fields in a fixed order, sorted, so a change shows up as the line that changed.