Add game center, per-model shuffle, audio focus fixes, README, tests

- README.md with build/architecture overview
- Game Center screen with at-bat timeline, pitch sequence, spray chart,
  and strike zone component views
- VideoShuffle service: per-model bucketed random selection with
  no-back-to-back guarantee; replaces flat shuffle-bag approach
- Refresh JWT token for authenticated NSFW feed; add josie-hamming-2
  and dani-speegle-2 to the user list
- MultiStreamView audio focus: remove redundant isMuted writes during
  startStream and playNextWerkoutClip so audio stops ducking during
  clip transitions; gate AVAudioSession.setCategory(.playback) behind
  a one-shot flag
- GamesViewModel.attachPlayer: skip mute recalculation when the same
  player is re-attached (prevents toggle flicker on item replace)
- mlbTVOSTests target wired through project.yml with
  GENERATE_INFOPLIST_FILE; VideoShuffleTests covers groupByModel,
  pickRandomFromBuckets, real-distribution no-back-to-back invariant,
  and uniform model distribution over 6000 picks

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

mlbTVOS/ViewModels/GameCenterViewModel.swift

@@ -1,24 +1,41 @@
 import Foundation
 import Observation
+import OSLog
+
+private let gameCenterLogger = Logger(subsystem: "com.treyt.mlbTVOS", category: "GameCenter")
+
+private func logGameCenter(_ message: String) {
+    gameCenterLogger.debug("\(message, privacy: .public)")
+    print("[GameCenter] \(message)")
+}
 
 @Observable
 @MainActor
 final class GameCenterViewModel {
     var feed: LiveGameFeed?
+    var highlights: [Highlight] = []
+    var winProbabilityHome: Double?
+    var winProbabilityAway: Double?
     var isLoading = false
     var errorMessage: String?
     var lastUpdated: Date?
 
     private let statsAPI = MLBStatsAPI()
+    @ObservationIgnored
+    private var lastHighlightsFetch: Date?
 
     func watch(game: Game) async {
         guard let gamePk = game.gamePk else {
+            logGameCenter("watch: no gamePk for game id=\(game.id)")
             errorMessage = "No live game feed is available for this matchup."
             return
         }
+        logGameCenter("watch: starting for gamePk=\(gamePk)")
 
         while !Task.isCancelled {
             await refresh(gamePk: gamePk)
+            await refreshHighlightsIfNeeded(gamePk: gamePk, gameDate: game.gameDate)
+            await refreshWinProbability(gamePk: gamePk)
 
             let liveState = feed?.gameData.status?.abstractGameState == "Live"
             if !liveState {
@@ -34,12 +51,44 @@ final class GameCenterViewModel {
         errorMessage = nil
 
         do {
+            logGameCenter("refresh: fetching feed for gamePk=\(gamePk)")
             feed = try await statsAPI.fetchGameFeed(gamePk: gamePk)
+            logGameCenter("refresh: success playEvents=\(feed?.currentPlay?.playEvents?.count ?? 0) allPlays=\(feed?.liveData.plays.allPlays.count ?? 0)")
             lastUpdated = Date()
         } catch {
+            logGameCenter("refresh: FAILED gamePk=\(gamePk) error=\(error)")
             errorMessage = "Failed to load game center."
         }
 
         isLoading = false
     }
+
+    private func refreshHighlightsIfNeeded(gamePk: String, gameDate: String) async {
+        // Only fetch highlights every 60 seconds
+        if let last = lastHighlightsFetch, Date().timeIntervalSince(last) < 60 {
+            return
+        }
+
+        let serverAPI = MLBServerAPI()
+        do {
+            highlights = try await serverAPI.fetchHighlights(gamePk: gamePk, gameDate: gameDate)
+            lastHighlightsFetch = Date()
+        } catch {
+            // Highlights are supplementary — don't surface errors
+        }
+    }
+
+    private func refreshWinProbability(gamePk: String) async {
+        do {
+            let entries = try await statsAPI.fetchWinProbability(gamePk: gamePk)
+            if let latest = entries.last,
+               let home = latest.homeTeamWinProbability,
+               let away = latest.awayTeamWinProbability {
+                winProbabilityHome = home
+                winProbabilityAway = away
+            }
+        } catch {
+            // Win probability is supplementary — don't surface errors
+        }
+    }
 }