feat: add a native CLI launcher for local and YouTube playback

Build .build/terebi beside the app. Parse a single local file or YouTube URL, --url, --, and help; reject invalid commands before GUI launch. Resolve the adjacent app through symlinks and launch through NSWorkspace, reusing its process/window and saved progress.

Launch the app without media before delivering URL events. Raw media argv suppress SwiftUI's initial singleton window. Own warm document and internet Apple events because SwiftUI's default external-event routing closes that window; retain initial Finder document delivery to create it.

Verified actual CLI 0/64/69 exit behavior, PATH/symlink discovery from another directory, cold local/YouTube playback, warm local/YouTube replacement in the same native window/process, resume, Finder-style cold launch, and make all check.

Sources/App/TerebiApp.swift

@@ -1115,11 +1115,31 @@ private struct WindowChrome: NSViewRepresentable {
 
 @MainActor
 final class AppDelegate: NSObject, NSApplicationDelegate {
+    func applicationWillFinishLaunching(_ notification: Notification) {
+        // Own external opens: SwiftUI's document routing can close the singleton Window.
+        let events = NSAppleEventManager.shared()
+        events.setEventHandler(self, andSelector: #selector(openInternetURL(_:withReplyEvent:)),
+            forEventClass: AEEventClass(kInternetEventClass), andEventID: AEEventID(kAEGetURL))
+    }
+
+    @objc private func openInternetURL(_ event: NSAppleEventDescriptor, withReplyEvent reply: NSAppleEventDescriptor) {
+        guard let text = event.paramDescriptor(forKeyword: keyDirectObject)?.stringValue else { return }
+        PlayerModel.shared.openYouTube(text)
+    }
+
+    @objc private func openDocuments(_ event: NSAppleEventDescriptor, withReplyEvent reply: NSAppleEventDescriptor) {
+        guard let url = event.paramDescriptor(forKeyword: keyDirectObject)?.atIndex(1)?.fileURLValue else { return }
+        PlayerModel.shared.open(url)
+    }
+
     func applicationDidFinishLaunching(_ notification: Notification) {
         NSApp.setActivationPolicy(.regular)
         NSApp.activate(ignoringOtherApps: true)
+        NSAppleEventManager.shared().setEventHandler(self, andSelector: #selector(openDocuments(_:withReplyEvent:)),
+            forEventClass: AEEventClass(kCoreEventClass), andEventID: AEEventID(kAEOpenDocuments))
     }
 
+    // Let SwiftUI create the initial window for a Finder/document launch.
     func application(_ application: NSApplication, open urls: [URL]) {
         if let url = urls.first { PlayerModel.shared.open(url) }
     }