feat(prompting): Phase A — suppress the two mush sources in poker mode

Per docs/superpowers/specs/2026-07-01-poker-prompts-design.md, Phase A. Two
independent pipeline fixes that reduce mush at the table, ahead of the classifier:

1. _mode_menu_note is no longer injected in poker_cash — mid-session she should
   not be offering to switch modes.
2. _route skips the register/mood nudge in poker_cash — the lexicon heuristic
   misfired (neutral logistics like "table broke, 11:50pm" read as tilt/fatigue).
   Poker register will come from the Phase B MENTAL fragment instead. Non-poker
   modes keep the nudge unchanged.

2 tests. Full suite 180 green.

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

lyra/mind.py

@@ -159,7 +159,10 @@ def build_messages(session_id: str, user_msg: str,
 
     # Mode awareness: she can offer to switch when the work clearly shifts (she decides
     # when — better than a keyword guess). One line, on his yes she calls set_mode.
-    messages.append({"role": "system", "content": _mode_menu_note(mode)})
+    # Suppressed at the live table (poker_cash) — mid-session she shouldn't be offering
+    # to change modes; it's pure noise when the job is logging and coaching.
+    if not (mode and mode.key == "poker_cash"):
+        messages.append({"role": "system", "content": _mode_menu_note(mode)})
 
     # Live ritual state (e.g. Alligator Blood ON) — dynamic, rides with the card.
     state_note = _mode_state_note(mode)
@@ -337,6 +340,12 @@ def _route(ctx: TurnContext) -> TurnContext:
     a charged emotional moment adds a per-turn register nudge (deterministic). Most
     turns are neutral and get no note — that's the point (don't over-narrate)."""
     ctx.mode = modes.get(memory.get_session_mode(ctx.session_id))
+    # At the live table the register comes from the poker prompt fragments (esp. the
+    # MENTAL one), not this lexicon nudge — which misfired, reading neutral logistics
+    # ("table broke, it's 11:50pm") as tilt/fatigue. Resolve the mode, but skip the
+    # register/note block in poker_cash. Non-poker modes keep the nudge unchanged.
+    if ctx.mode and ctx.mode.key == "poker_cash":
+        return ctx
     m = ctx.moment or {}
     note = None
     if m.get("tilt", 0) >= _TILT_BAR: