v0.11.7 — daemon-owned tray (clean release)

Clean tagged release capturing the current tree — the daemon-owned tray work plus the CI fix (main had advanced one commit past the v0.11.6 tag). No runtime change versus v0.11.6.

Highlights (since the split landed):

• Background download daemon owns the queue over a local socket; the GUI is a client and downloads keep running while the window is closed.
• The tray / menu-bar icon lives in the daemon — a persistent presence (macOS status item / Windows notification area). Open Concierge / Downloads: N / Quit.
• nxm:// one-clicks land in the daemon (queued + a GUI ensured), never a second window.

Windows note: a new tray icon may hide in the "^" overflow — drag it onto the taskbar to pin it.