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docker-exec-console.md gains a "Terminal geometry and size forwarding"
section: the WS binary control-frame protocol ({"cols","rows"} -> NAWS /
asyncssh resize), the tall 511x10000 default and when it is applied or
restored, the exec-creation race handling, the GNS3_CONSOLE_RESIZE=0
knob for paging CLIs, and the SR Linux flicker root cause with the
measured numbers (rows-driven ~2.4x output inflation on CPR-answering
clients; width-independent; sr_cli's scroll-append re-rendering is
inherent and identical outside GNS3).
vendor-nos-xrd.md: the appliance recipe now includes
GNS3_CONSOLE_RESIZE=0 with the rationale (shared exec + XR pager vs
browser resizes). New troubleshooting entry for the flicker symptom.