Trump card: draw from the stack, no trump for wizards and jesters

- Deal the hands from the shuffled stack and draw the trump card from it,
  so the trump card is in nobody's hand and cannot be played
- A wizard or jester as trump card means no trump suit (previously a
  wizard let the dealer choose); remove the trump selection phase, the
  ChooseTrump action, the trump picker UI and the AI trump actions
- Completed tricks carry their round's trump card, so the table keeps
  showing the matching trump card while the last trick of a round is
  displayed
- Card corners are no longer rotated, so 6 and 9 cannot be confused
- Trump label explains why there is no trump (wizard, jester, last round)
- Tests: trump card never dealt, special cards give no trump, tricks keep
  their trump card

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

wizard_ai/README.md

@@ -6,7 +6,7 @@ provides everything around it.
 - `agents/` — `Agent` interface (`act(observation) -> action`) plus `RandomAgent`,
   `HeuristicAgent` (baseline / fallback) and `ModelAgent` (wraps a `Policy`)
 - `model/encoding.py` — observation → fixed-size feature vector (`FEATURE_SIZE`), and the fixed
-  action space (21 bids + 60 cards + 4 trump suits) with legal-action masks; works for 3–6 players
+  action space (21 bids + 60 cards) with legal-action masks; works for 3–6 players
 - `model/policy.py` — **the place to plug in the model**: subclass `Policy`, implement
   `select`, `update`, `save_weights`/`load`, register with `@register_policy`.
   `UniformPolicy` is a placeholder so the pipeline runs end to end.