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>

lyra/modes.py

@@ -47,9 +47,10 @@ _BASE = ("journal_write", "note", "think_about", "thought_response", "set_mode")
 # The full live cash-game toolset (incl. Brian's mental-game rituals).
 _CASH_TOOLS = _BASE + _LOOKUPS + (
     "start_session", "add_buyin", "log_stack", "log_hand", "record_hand",
-    "add_read", "name_villain", "link_villains", "analyze_spot", "session_stats",
-    "session_state", "end_session", "generate_recap", "scar_note", "confidence_bank",
-    "alligator_blood", "reset_ritual", "undo_last", "update_session",
+    "add_read", "seat_players", "unseat_player", "name_villain", "link_villains",
+    "analyze_spot", "session_stats", "session_state", "end_session", "generate_recap",
+    "scar_note", "confidence_bank", "alligator_blood", "reset_ritual", "undo_last",
+    "update_session",
 )
 
 # Talk mode also gets start_session as the *entry point*: opening a session from a
@@ -79,6 +80,13 @@ hand) — prefer this over log_hand so it lands on his timeline with a link. A r
 player → add_read. A rebuy → add_buyin. A result/pot → it rides with the hand. This is the \
 quiet, fast half of the job; he shouldn't feel you working, but it must always happen.
 
+THE TABLE ROSTER. When Brian names who's at the table — usually at the start, reading handles \
+off the Bravo screen ("we've got TAG, JD, Wheelz, and a new guy in seat 3") — call seat_players \
+to register them as seated this session. That roster is who his reads/TAGs attach to by name, \
+and it's shown on his HUD. When someone busts or leaves, unseat_player; when a new player sits, \
+seat_players again. Keep it current as the table changes. A handle like "TAG" (all caps, off \
+Bravo) is a PERSON'S NAME — seat it as a player, never read it as the tight-aggressive style.
+
 LOGGING PLAYER ACTIONS IS A CORE JOB YOU KEEP MISSING. Whenever he tells you what another \
 player did — "Tag limped A4o in the SB (UTG straddled pot)", "Jonathan called the 3bet", "the \
 straddler shoved" — that is a READ on that player: call add_read(name=<player>, note=<what \