The docker_exec console resized its exec PTY to 80x24 until a client
sent NAWS. CLIs that page on the PTY window size instead of the
terminal length (the IOS-XR pager) therefore parked long output at
--More-- for clients that never negotiate NAWS — netmiko, bare telnet —
making copilot device commands time out on XRd.
Default the exec to 511x10000 instead (511 matches netmiko's own
'terminal width 511' convention): no paging and no hard wrapping for
non-NAWS clients, while real NAWS clients keep resizing to their actual
geometry as before.
Also updates the project memory record with the confirmed root cause
and the fix.
Root cause (confirmed live): the XRd console reaches the container CLI
via docker exec, and the XR pager reads the exec PTY's 24-row window
(TIOCGWINSZ) instead of the CLI-level terminal length — so
'terminal length 0' shows in 'show terminal' yet long-output commands
page after exactly 24 lines and park at --More--, making netmiko time
out. '| no-more' does not exist on IOS-XR.
Also documents the agreed copilot-side fix design (tail-anchored
--More-- detection with quiet double-confirmation, reconnect before
retry, session_log), for the upcoming feat/copilot-xrd-more-handling
branch.
