style: drop "— Game X" from all series blurbs

The game number is redundant with the series summary already shown on
the card. Blurbs now read cleaner: "Win-or-go-home." instead of
"Win-or-go-home — Game 7."

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

app/playoff.py

@@ -119,18 +119,18 @@ def series_blurb(game):
     # the next matchup \u2014 fall through to a generic series-score blurb instead.
     if not is_final:
         if state["is_game7"]:
-            return "Win-or-go-home \u2014 Game 7."
+            return "Win-or-go-home."
         if state["is_clincher"] and leader_name:
-            return f"{leader_name} can close it out \u2014 Game {g}."
+            return f"{leader_name} can close it out."
         if state["is_pivotal"]:
-            return f"Series tied 2\u20112 \u2014 pivotal Game {g}."
+            return "Series tied 2\u20112 \u2014 pivotal."
         if state["is_opener"]:
             return "Series opener"
     if leader_name and trailer_name:
         return f"{leader_name} lead {state['hi']}\u2011{state['lo']}"
     if state["hi"] == state["lo"]:
-        return f"Series even at {state['hi']}\u2011{state['lo']} \u2014 Game {g}."
-    return f"Game {g}."
+        return f"Series even at {state['hi']}\u2011{state['lo']}."
+    return ""
 
 
 def series_badges(game):