Feat/macos terminal

[imkarrer]

zen already supports iTerm2 and Ghostty on macOS, but both are extra installs. Users who stay on Terminal.app had no way to open review/work tabs without switching emulators. This is the same backend abstraction as kitty: a small AppleScript wrapper behind terminal: macos.

Notes

• If Terminal already has a window, zen opens a new tab in the front window; if none exist, it opens a new window.
• The shell command is passed via the ZEN_MACOS_CMD env var so AppleScript does not have to escape the command string.
• macOS-only. Config validation accepts iterm, ghostty, kitty, or macos.
• Opt-in e2e (not part of go test ./...): ZEN_E2E_MACOS=1 go test -tags e2e ./internal/macos -run TestOpenTabE2E. Needs Automation permission for osascript → Terminal.

Test plan

• zen setup accepts macos and writes terminal: macos to config
• Invalid terminal values still error; empty still defaults to iterm
• With terminal: macos, zen review / zen work new open a Terminal.app tab in the worktree and run the agent
• With no Terminal windows open, a new window is created instead of a tab
• Existing iterm / ghostty / kitty configs are unchanged
• Optional: run the e2e above and confirm the marker file is created

[imkarrer]

@mgreau found a small issue with opening tabs when using this from my fork.

To do a proper zen review you will need to refresh the worktree and context manually. Sorry for opening that permaturely. #18

Loving the tool so far.

git -C ~/<checkoutpath>/zen fetch origin +pull/16/head:pr-16
git -C ~/<checkoutpath>/zen-pr-16 merge --ff-only pr-16
zen context inject ~/<checkoutpath>/zen-pr-16 --pr 16 --repo zen

[mgreau]

Thanks, LGTM!