Tested via tmux in a dedicated worktree. The branch pushed successfully, but PR creation inside the Codeplane TUI hit a git fetch failure caused by a broken refs/jj/keep object in the shared repo; after deleting the invalid ref, the PR existed and could be inspected normally.

I also verified the landing-request path is still JJHub-specific: the Landings view supports create/review/comment/land interactions, but this repo currently has no GitHub PR landing integration and no open landing requests to exercise end-to-end from the UI.

UX polish notes from exercising the flow:\n- workspace attach now has the right tmux persistence model, but it still needs a surfaced UI affordance for sandbox mode selection/status (auto vs required vs off)\n- the PR flow should handle git/jj ref corruption more gracefully and explain the remediation inline instead of failing during fetch\n- GitHub automation is still missing first-class TUI support for PR creation/comments/landing parity, so the current feature set is backend-only and should be wired into the Smithers/Codeplane views\n- landing requests are polished on the JJHub side, but there is still no equivalent GitHub-backed landing/merge request flow in the UI

Follow-up productionization pass:

• added a dedicated GitHub Pull Requests view in the TUI with list/detail rendering, draft PR creation, PR comments, and command-palette navigation
• added visible sandbox controls to the Workspaces view so attach behavior can cycle between auto, bwrap-required, and off
• hardened GitHub PR creation helpers to derive the target repo from the origin remote instead of local gh context, and added actionable handling for broken refs/jj/keep git failures

Validation run for this pass:

• go test ./internal/github ./internal/ui/views ./internal/ui/dialog ./internal/jjhub
• go build .

Latest update pushed in 14e7221b:

• surfaced Pull Requests directly in the dashboard for faster discovery
• made the PR view consistently use the origin remote repo for creation flows
• revalidated the PR view in tmux after the repo-targeting fix

This branch is clean and pushed.