feat: live mental-game rituals in Cash mode

Brian's own rituals (mined from his logs) become first-class, live tools instead
of post-hoc recap sections:

- Scar Note — instructive mistakes with the punt/cooler/standard distinction.
- Confidence Bank — good process, banked regardless of result.
- Alligator Blood — invokable adversity state; she suggests it when he's
  card-dead/short/stuck, and her coaching register shifts while it's on (live
  state injected into context per-turn via chat._mode_state_note).
- Reset — tilt circuit-breaker; mental marker only, stats stay continuous.

poker_rituals table + log_ritual/list_rituals/set_alligator/alligator_active;
4 tools added to the Cash toolset and taught in the mode card; HUD gains a 🐊
banner + Confidence Bank + Scar Notes panels; recap grounded via _rituals_block.
tests/test_modes.py +5 ritual tests; 41 green.

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

README.md

@@ -55,6 +55,10 @@ Talk to her during a session; she drives tools behind the scenes:
 - **Session tracking** — `start_session`, `add_buyin`, `end_session` → net, hours, $/hr.
 - **Stack tracking** — `log_stack` records your stack as the night goes → live net
   while you're still sitting, and a stack-over-time sparkline on the HUD.
+- **Mental-game rituals** — your own system, run live: **Scar Notes** (punt / cooler
+  / standard), **Confidence Bank** (good process, banked regardless of result),
+  **Alligator Blood** mode (adversity register she'll suggest when you're card-dead /
+  stuck), and **Reset** (tilt circuit-breaker). They surface on the HUD and ground the recap.
 - **Hand histories** — vomit rough shorthand ("AKs btn, 3bet, flop A72…"), she
   reconstructs a structured, **replayable** hand (unknown cards = `x`, never invented).
 - **Villain file** — named opponents auto-build persistent dossiers; basic stats