pr: https://git.cafe/pingdotgg/t3code/pulls/26633
main: 6575ce32508bd7908444241f3719aa33aaf77f90
head: a8d8afac1c32e4cea69b40452920902999e6e31b
client: Linux, /usr/bin/google-chrome 151.0.7922.108, repo Playwright 1.60.0
main server/web: 16733/8693, /home/user/main/.t3
head server/web: 13773/5733, /home/user/t3code/.t3
one dev server running at a time; main stopped before head startup.

setup:
git worktree add ../main github/main
vp i
background vp run dev, captured PID 34587
created project /home/user/clipboard-project through Add project > Local folder
selected Codex GPT-6.1-Sol; sent real turn to create README.md
observed README.md: Clipboard verification project.
stopped main; checked out exact PR head; vp i
copied stopped main's isolated app-created state to head's .t3
background vp run dev --home-dir /home/user/t3code/.t3
sent real Codex GPT-6.1-Sol turn to read README.md without changes
observed assistant reply: Clipboard verification project.

main reproduction:
remote: real https://www.wikipedia.org search field, selected Clipboard verification project
local clipboard: local clipboard marker
native Chrome Find and edit > Copy: local clipboard marker remains
native Chrome Find and edit > Cut: trusted cut event on surface TEXTAREA
remote search field remains selected and unchanged; local paste: local clipboard marker

head:
native Chrome Find and edit > Copy: trusted copy event on surface TEXTAREA
stream sends one c down/up pair, modifiers=2
server replies {type:clipboard,text:Clipboard verification project}
local composer paste: Clipboard verification project; remote source preserved
native Chrome Find and edit > Cut: trusted cut event on surface TEXTAREA
stream sends one x down/up pair, modifiers=2
server replies {type:clipboard,text:Clipboard verification project}
local composer paste: Clipboard verification project; remote source cleared
accepted Chrome's normal clipboard permission prompt through the native UI

neighbors:
Ctrl+X: one x down/up pair, one clipboard reply; local paste: keyboard cut check
local copy, remote Ctrl+V, remote Ctrl+A/Ctrl+C, local paste: remote paste check
keyboard Copy, blur to local composer, refocus remote surface, native Copy: passes

focused existing checks through blacksmith-check:
vp i
cd apps/web && vp exec playwright install --with-deps chromium
vp test run src/browser/ServerBrowserSurface.browser.test.tsx
1 test file passed, 3 tests passed (native forwarding/refocus, keyboard deduplication, no-control cancellation)
initial check attempt could not launch missing worker Chromium; installed it and reran successfully

limits: no packaged Electron client, macOS, Windows, native iOS/Android, live second-viewer transfer,
relay/tunnel mode, or non-text clipboard formats exercised in this verification.
No code changes, commits, pushes, merges, rebases, labels, or other PR changes.