fix(tmux): refuse text dropped by composer - #2800

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SimTet wants to merge 3 commits into

kunchenguid:mainfrom

SimTet:fm/fm-tmux-preexisting-failures

Commits on Aug 22, 2026

fix(tmux): refuse steers not accepted by composer
SimTet
committed
7a97984
no-mistakes(review): Harden tmux composer append verification
SimTet
committed
7b085ee
no-mistakes(document): Document tmux composer acceptance refusal
SimTet
committed
20aec68