* test(e2e): add golden E2E tests for workspace session management
- Restore exact file and terminal state after quit/relaunch
- Verify terminal file link activation and external edit detection
- Test worktree creation and switching with isolated terminals
- Isolate test repo paths between concurrent CI runs with UUIDs
* Add platform-aware marker echo command utility
- Create splitMarkerEchoCommand() to generate shell commands that
safely echo test markers across Windows and Unix platforms
- Split markers into prefix/suffix fragments so output assertions
prove execution, not just shell echo-back
- Consolidate SORTABLE_TAB export and improve tab bar locator logic
- Refactor terminal link helpers to extract client point calculation
