Q#KR1-11: Lua ring on a per-frontend command-boundary substrate.
Eight-row boundary table (keybound/self-insert/unbound/GPU-optimistic/
pointer/paste/menu/M-x-interactive); stable ring-entry ids so shared-
ring interleaving cannot corrupt per-frontend chains or yank sessions;
sessions carry {buffer,start,end,entry_id,text} snapshots with slice
verification. Three shipped bugs in scope (Q#KR10): semantic-path Paste
drop (GPU Ctrl-V is a no-op today), missing after-edit for M-x/menu/
paste edits, and paste trusting the client-supplied payload id instead
of the dispatcher's authenticated source. Q#KR11: frontend.detached
hook + command_history detach cleanup. Incorporates three review
rounds.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
