feat: live table roster — seat_players / unseat_player + HUD card

The missing backbone for read tracking: a place for "who's at the table" to live.
When Brian reads the table off Bravo (handles like TAG), Lyra registers them as
seated this session; reads/TAGs then attach to those players by handle instead of
spawning duplicates or getting missed.

- session_players table; seat_player/seat_players/unseat_player/session_roster;
  _resolve_or_create_player (shared name/descriptor resolution, dedupe guard).
- tools seat_players (accepts objects or a plain name list) + unseat_player.
- HUD gains `roster`; Session page shows a 🪑 Table card (seat, handle, category,
  read count, last read).
- Cash card: capture the roster when he names the table; a Bravo handle like TAG
  is a PERSON, seated as a player — never the tight-aggressive style.

5 tests. Full suite 162 green.

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

tests/test_roster.py

@@ -0,0 +1,79 @@
+"""Live table roster: seat players, attach reads by handle, roster on the HUD."""
+from __future__ import annotations
+
+import importlib
+
+import numpy as np
+import pytest
+
+
+def _fake_embed(texts):
+    out = []
+    for t in texts:
+        v = np.zeros(64, dtype=np.float32)
+        for w in t.lower().split():
+            v[hash(w) % 64] += 1.0
+        out.append((v if v.any() else np.full(64, 1e-6, dtype=np.float32)).tolist())
+    return out
+
+
+@pytest.fixture
+def mods(tmp_path, monkeypatch):
+    monkeypatch.setenv("LYRA_DB_PATH", str(tmp_path / "test.db"))
+    from lyra import llm
+    monkeypatch.setattr(llm, "embed", _fake_embed)
+    import lyra.memory as memory
+    importlib.reload(memory)
+    import lyra.poker as poker
+    importlib.reload(poker)
+    import lyra.tools as tools
+    importlib.reload(tools)
+    return poker, tools
+
+
+def test_seat_players_builds_roster(mods):
+    poker, _ = mods
+    poker.start_session(venue="Meadows", buy_in=300)
+    n = poker.seat_players(["TAG", "Jonathan", {"name": "Wheelz", "seat": "3"}])
+    assert n == 3
+    roster = poker.session_roster()
+    names = {r["name"] for r in roster}
+    assert names == {"TAG", "Jonathan", "Wheelz"}
+    assert next(r for r in roster if r["name"] == "Wheelz")["seat"] == "3"
+
+
+def test_read_attaches_to_seated_player_by_handle(mods):
+    poker, _ = mods
+    poker.start_session(venue="Meadows", buy_in=300)
+    poker.seat_players(["TAG"])
+    poker.add_read(note="limped A4o from the SB, UTG straddle", name="TAG")
+    roster = poker.session_roster()
+    tag = next(r for r in roster if r["name"] == "TAG")
+    assert tag["reads"] == 1 and "A4o" in tag["last_note"]
+    # No duplicate TAG spawned — the read landed on the seated player.
+    assert sum(p["name"] == "TAG" for p in poker.get_villain_file()) == 1
+
+
+def test_seat_players_tool_and_roster_in_hud(mods):
+    poker, tools = mods
+    poker.start_session(venue="Meadows", buy_in=300)
+    out = tools.dispatch("seat_players", {"players": [{"name": "TAG"}, {"name": "JD"}]}, {})
+    assert "TAG" in out and "JD" in out
+    assert len(poker.hud()["roster"]) == 2
+
+
+def test_unseat_player_removes_from_roster_keeps_history(mods):
+    poker, _ = mods
+    poker.start_session(venue="Meadows", buy_in=300)
+    poker.seat_players(["TAG"])
+    poker.add_read(note="showed a bluff", name="TAG")
+    assert poker.unseat_player(name="TAG") is True
+    assert poker.session_roster() == []                 # off the table
+    assert poker.player_profile("TAG")["reads"]         # history intact
+
+
+def test_seat_players_accepts_plain_name_list_via_tool(mods):
+    poker, tools = mods
+    poker.start_session(venue="Meadows", buy_in=300)
+    tools.dispatch("seat_players", {"players": "TAG, JD, Wheelz"}, {})
+    assert {r["name"] for r in poker.session_roster()} == {"TAG", "JD", "Wheelz"}