feat: enrich Miruro URL playback metadata and timeline

Checks/resolved-playback.swift

@@ -22,6 +22,11 @@ struct ResolvedPlaybackCheck {
     }
 
     static func run() async throws {
+        PlayerModel.metadataLifecycleCheck()
+        if CommandLine.arguments[1] == "--metadata-lifecycle" {
+            print("PASS: metadata lifecycle replacement, A-B-A stale results, and actual-duration changes")
+            return
+        }
         _ = NSApplication.shared
         NSApp.setActivationPolicy(.prohibited)
         let input = CommandLine.arguments[1]
@@ -47,6 +52,19 @@ struct ResolvedPlaybackCheck {
         }
         print("PASS: resolved HLS decodes video/audio and advances")
         fflush(stdout)
+        if input.hasPrefix("https://") {
+            try await until("descriptive title and measured-duration metadata bands", model: model) {
+                model.fileName != source.title && !model.visibleIntervals.isEmpty
+            }
+            let intervals = model.visibleIntervals
+            require(intervals.allSatisfy {
+                $0.start.isFinite && $0.end.isFinite && $0.start >= 0 &&
+                    $0.end > $0.start && $0.end <= model.state.duration
+            }, "bands use finite in-bounds actual media duration")
+            require(intervals.filter { $0.kind == .intro }.count <= 1 &&
+                    intervals.filter { $0.kind == .outro }.count <= 1, "at most one band of each kind")
+            print("PASS: Miruro title '\(model.fileName!)' and \(intervals.count) measured-duration bands")
+        }
         require(model.setPlayback(playing: false), "pause accepted")
         try await until("pause acknowledged", model: model) { model.state.status == PLAYER_PAUSED }
         require(model.state.can_seek && model.state.duration > 0, "seekable measured duration")