Implement Nasty Notice

[bcollazo]

Summary

• add Nasty Notice to trainer move generation and trainer effect dispatch
• make the effect queue discard choices for the opponent until they reach 4 cards
• add unit tests covering the discard-choice generation and the no-op case at 4 cards

Validation

• cargo test nasty_notice --lib --features test-utils -- --nocapture
• cargo run --bin card_test -- "B2b 065"
• cargo clippy --fix --allow-dirty -- -D warnings
• cargo test --features tui,test-utils