feat: reads/players API + REST route conformance test

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01G796GsLCvJQKVN7hwV2cDx

lyra/poker.py

@@ -1023,6 +1023,25 @@ def upsert_player(name: str, venue: str | None = None, description: str | None =
     return int(cur.lastrowid)
 
 
+_PLAYER_FIELDS = ("name", "venue", "description", "tendencies", "adjustment", "category")
+
+
+def update_player(player_id: int, **fields) -> dict | None:
+    """Edit a player's dossier (rename, fix tendencies/category). Returns the row or None."""
+    sets, vals = [], []
+    for k, v in fields.items():
+        if k in _PLAYER_FIELDS and v is not None:
+            sets.append(f"{k} = ?")
+            vals.append(v)
+    if sets:
+        conn = _c()
+        with conn:
+            conn.execute(f"UPDATE poker_players SET {', '.join(sets)} WHERE id = ?",
+                         (*vals, player_id))
+    row = _c().execute("SELECT * FROM poker_players WHERE id = ?", (player_id,)).fetchone()
+    return dict(row) if row else None
+
+
 def add_read(note: str, seat: str | None = None, name: str | None = None,
              session_id: int | None = None, **player_fields) -> int:
     """Log a live read. If `name` is given, upsert the player and link the read."""