feat: session_state read tool so she can see the HUD

She could write everything the HUD shows but not read most of it back (stack,
live net, alligator state, scar/confidence entries) — so "what's my live net?"
or "what's in my confidence bank?" was a memory guess.

- session_state tool returns the same bundle the HUD renders, as a readable
  summary; added to the Cash toolset.
- Cash card tells her the HUD exists, that she and it share the same data, and to
  answer where-am-I questions from session_state, never memory.
- test_modes.py +1; 42 green.

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

lyra/modes.py

@@ -41,8 +41,8 @@ _BASE = ("journal_write", "note")
 # 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", "analyze_spot", "session_stats", "end_session", "generate_recap",
-    "scar_note", "confidence_bank", "alligator_blood", "reset_ritual",
+    "add_read", "analyze_spot", "session_stats", "session_state", "end_session",
+    "generate_recap", "scar_note", "confidence_bank", "alligator_blood", "reset_ritual",
 )
 
 # Talk mode also gets start_session as the *entry point*: opening a session from a
@@ -71,6 +71,13 @@ question, call analyze_spot and report its numbers — never eyeball board math.
 session current as the night goes; you can pull session_stats or a player's profile whenever \
 it helps. When he's ready to leave, end_session, and write the recap if he wants it.
 
+Everything you log appears on Brian's live HUD (the Session view) — stack, live net, \
+hands, villains, the confidence bank, the scar notes, and whether Alligator Blood is on. \
+That HUD and you read the SAME data. So when he asks where he's at — his stack, his live \
+net, what's in the bank tonight, whether gator mode is on — call session_state and answer \
+from what it returns, never from memory. You can point him at the HUD too ("it's on your \
+Session screen"), but you can always just tell him.
+
 BRIAN'S RITUALS — his mental-game system. Run them, don't just reference them:
 • SCAR NOTE (scar_note) — a painful, instructive mistake to study. Log it when he punts, \
 gets over-attached, or leaks — and classify it honestly: punt (his error), cooler \