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

tests/test_poker_api.py

@@ -64,3 +64,19 @@ def test_post_hand_edit_and_delete(client):
     r3 = c.delete(f"/hand/{hid}")
     assert r3.json()["ok"] is True
     assert poker.get_hand(hid) is None
+
+
+def test_post_read(client):
+    c, poker = client
+    poker.start_session(buy_in=400)
+    r = c.post("/session/read", json={"note": "3-bets light", "name": "James K"})
+    assert r.json()["ok"] is True
+    assert isinstance(r.json()["id"], int)
+
+
+def test_rename_player_fixes_mislabel(client):
+    c, poker = client
+    pid = poker.upsert_player("Dave the rock", category="reg")
+    r = c.patch(f"/player/{pid}", json={"name": "Dave the mechanic"})
+    assert r.json()["ok"] is True
+    assert r.json()["player"]["name"] == "Dave the mechanic"