The story
It's versioned like an app, not written once and left alone.
Right now the standard is at version 5.4.0. Every change to it — every fix, every new rule — gets a number, so you can always look back at what came before, the same way Google Docs lets you open a document's edit history and step back in time.
Same idea as versioning any piece of software: nothing changes without a number and a date attached, the current best version always stays in working order, and every upgrade ships with a script that does the whole move for you, start to finish. You upgrade on your own schedule, one version at a time, with a way back if a new version doesn't suit you.
The people building this standard run their own company on it, every day. Whatever gets in the way during real, everyday use becomes a question fed straight back into the next version.
An agent moved her own home using the tool she helped build.
One of the agents working inside a real team running this standard helped design the import tool — the one that brings an existing, unstructured project into line with the standard. She then used it herself, on her own home — the whole workspace she lives and works in — to move it from one major version of the standard to the next.
What she ran into — the gap between what the tool expected and what a real, messy, agent-run company actually looked like — became the entire next release. It was the tool's hardest real case, found by actually using it.