Screens 1 and 4 running as TUIOS panes: reply screen, adopt-or-create launcher, layout script

CHECKLIST.md

@@ -37,9 +37,12 @@ been measured.
       → seen in a real terminal: `TODO (1) / BLOCKED (1) / DONE (2)`, with
       `[AUD-161 todo]` shown against the blocked task. Resize shows "too small" below
       56×12 instead of a broken tree.
-- [ ] Screen 4 shows the thread and posts a reply with the user key. → client call `PostComment`
-      exists; the screen does not.
-- [ ] Pass: move a blocked task forward from the terminal, no browser, no shell.
+- [x] Screen 4 shows the thread and posts a reply with the user key. → `bin/screen reply AUD-162`
+      shows the conversation; typing and pressing Enter posts, and `s` picks a status to send
+      with it. Posted as `authorType: user`.
+- [x] Pass: move a blocked task forward from the terminal, no browser, no shell.
+      → `AUD-162` went `blocked` → `todo` from the reply screen, with a comment, and the
+      activity record names the person. Verified against the API afterwards.
 
 ## Milestone 3 — add a task, watch it work