fix: show correct "Game X of 7" for future playoff dates

Enrich raw score-endpoint games with gameNumber from the series cache
before parsing. The score API omits gameNumber and its seriesStatus
reflects current wins, so all future games in a series computed the
same number. Now we cross-reference by game id against the cached
series-detail endpoint which includes the correct gameNumber per game.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/playoff_cache.py

@@ -158,6 +158,55 @@ def fetch_series(series_id):
         return None
 
 
+# ── Game-number enrichment ────────────────────────────────────────
+
+
+def enrich_game_numbers(raw_games):
+    """Inject gameNumber from cached series data into raw score-endpoint games.
+
+    The /v1/score/{date} endpoint omits gameNumber. For future dates the
+    fallback computation (top_wins + bot_wins + 1) gives every game in a
+    series the same number. The series-detail endpoint includes gameNumber,
+    so we cross-reference by game id.
+    """
+    need = {}
+    for game in raw_games or []:
+        if game.get("gameType") != 3:
+            continue
+        if isinstance(game.get("gameNumber"), int) and game["gameNumber"] > 0:
+            continue
+        ss = game.get("seriesStatus") or {}
+        letter = ss.get("seriesLetter") or ss.get("seriesAbbrev")
+        if not letter:
+            continue
+        start = game.get("startTimeUTC") or ""
+        try:
+            year = (
+                datetime.fromisoformat(start.replace("Z", "+00:00"))
+                .astimezone(EASTERN)
+                .year
+            )
+        except (ValueError, AttributeError):
+            year = datetime.now(EASTERN).year
+        sid = f"{year}-{letter.upper()}"
+        need.setdefault(sid, []).append(game)
+
+    for sid, games in need.items():
+        payload = fetch_series(sid)
+        if not payload:
+            continue
+        lookup = {}
+        for sg in payload.get("games") or []:
+            gid = sg.get("id")
+            gn = sg.get("gameNumber")
+            if gid is not None and isinstance(gn, int) and gn > 0:
+                lookup[gid] = gn
+        for game in games:
+            gid = game.get("id")
+            if gid is not None and gid in lookup:
+                game["gameNumber"] = lookup[gid]
+
+
 # ── Per-round start dates (drive the "Day N" banner) ──────────────
 
 ROUND_DATES_KEY = "meta:round_start_dates"