headless ant/term ↗

fix: declare cr in terminfo -- another real capability missing by omission cr (carriage return) was simply never declared, with no comment suggesting it was deliberate (unlike bce's history) -- feed_ground's bare '\r' handling (vt/parser.odin) has always correctly reset cursor_x to 0. Same shape of consequence as the bce gap: an ncurses-linked TUI's cursor-movement optimizer won't reach for "\r" without seeing cr declared, and can fall back to a cursor-down move alone (cud) to reach a target row -- which, correctly, never touches the column, landing a redraw at whatever column the cursor already happened to be on. Root-caused via a real nvim session: switching modes wrote the mode indicator (NORMAL/VISUAL/COMMAND) at the edit cursor's column instead of the statusline's left edge, garbling whatever text was already there -- reproduced byte-for-byte by replaying the exact capture into a real tmux pane. Adds a bce-style behavior-linking test (see the commit that added that pattern) rather than a second independent capability list entry.