* fix(remote): focus host-delegated split panes
Return the authoritative leaf identity from terminal.split, record viewer-local focus intent behind the captured pairing revision, and replay the mirrored layout before focusing the exact pane. Preserve old-host fallback and prevent delayed split responses from stealing focus after the viewer moves away.
Add deterministic runtime, renderer, concurrency, compatibility, and headed paired-Electron coverage for Cmd+D, header splits, and immediate PTY input routing.
Fixes#16510
* fix(remote): preserve split focus across tab groups
Resolve the initiating source tab and leaf from the remote PTY, while keeping the viewer's current focus as a separate anti-steal baseline. This lets context-menu/header splits from non-focused group tabs focus their result without allowing delayed responses to override a later navigation.
* test(remote): drive split focus with key events
* test(remote): use the platform split shortcut
* fix(remote): fence concurrent split focus intent
* fix(remote): harden split focus ordering
* fix(remote): preserve split focus after runtime refactor
* fix(remote): fence stale split focus gestures
* test(remote): keep split focus regression within line budget
Gate release publishing on tag-scoped E2E, harden Droid agent-status routing against renderer layout races, and stabilize the affected E2E setup helpers.
Jinwoo Hong
Neil
OrcaWin
slashdevcorpseandBrennan Benson
Jinjing