* test(e2e): gate the tab-bar agent launcher on Windows shells and WSL
The `+` menu agent launcher had no golden coverage in the Windows lane, so a
Windows-only break anywhere in its chain (detection row, startup-plan build,
tab create, PTY spawn, startup-command injection) could ship unnoticed.
Adds a golden spec that launches a stub agent from the menu and asserts the
agent's own banner reached the pane — a tab that spawned a bare shell instead
is indistinguishable at the store/tab layer. Runs two agents everywhere, and
on Windows also PowerShell, cmd, Git Bash and a WSL project runtime.
* test(e2e): track WSL stub agent staging state for precise cleanup
Refactor `stageWslGoldenStubAgent` to track which artifacts it creates
during setup, then only remove those artifacts during cleanup. This
prevents the test from destructively removing pre-existing symlinks or
state from previous runs, improving test isolation and idempotency.
* test(e2e): track WSL stub agent staging state for precise cleanup
- Back up and restore pre-existing stub agents to avoid destroying them
- Simplify verbose test comments to match project style guidelines
* test(e2e): serialize WSL stub agent setup with distributed lock
- Add mkdir-based lock to prevent concurrent staging invocations
- Reclaim stale locks after 10 minutes to recover from crashes
- Track lock ownership in stage state for safe cleanup
* test(e2e): track WSL stub agent staging state for precise cleanup
Track which stubs this test helper stages by writing a marker file, then
only remove stubs during stale-lock recovery if we created them. Prevents
cleanup from removing stubs left by other processes.
Jinjing
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