fix: scope a session's "her notes" to its own time window

The HUD's notes list filtered journal/note entries by `created_at >= started_at`
with no upper bound, so a *closed* session kept absorbing every note she wrote
afterward — a session from last Saturday would show a note jotted 25 minutes ago.

Cap the window at `ended_at` for closed sessions; live sessions (no end yet) stay
open-ended as before.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tests/test_poker.py

@@ -18,6 +18,27 @@ def lyra(tmp_path, monkeypatch):
     return poker
 
 
+def test_hud_notes_scoped_to_session_window(lyra):
+    poker = lyra
+    from lyra import memory
+    sid = poker.start_session(venue="Meadows", stakes="1/3", buy_in=300)
+    s = poker.get_session(sid)
+    started = s["started_at"]
+    # A note written mid-session (>= started, before it ends) belongs to it.
+    conn = memory._connection()
+    with conn:
+        conn.execute("INSERT INTO journal (created_at, kind, content) VALUES (?,?,?)",
+                     (started, "note", "villain 3 overfolds turn"))
+    poker.end_session(cash_out=540, session_id=sid)
+    # A note written well after the session closed must NOT show up on it.
+    with conn:
+        conn.execute("INSERT INTO journal (created_at, kind, content) VALUES (?,?,?)",
+                     ("2999-01-01T00:00:00+00:00", "note", "thought from the far future"))
+    contents = [n["content"] for n in poker.hud(sid)["notes"]]
+    assert "villain 3 overfolds turn" in contents        # inside the window
+    assert "thought from the far future" not in contents  # after ended_at
+
+
 def test_session_lifecycle_and_net(lyra):
     poker = lyra
     sid = poker.start_session(venue="Meadows", stakes="1/3", buy_in=400)