[codex] Implement Houndstone and Klefki effects

[RogerAngell99]

Summary

• implement Houndstone [B2a 053] Last Respects as 50 + 20 damage per Psychic Pokemon in the attacker's discard pile
• implement Klefki [B1 120]/[B1 330] Dismantling Keys through the AbilityMechanic flow
• add focused Pokemon integration tests for base damage, discard filtering, ability availability, tool discard, and Giant Cape KO handling

Validation

• cargo test --features test-utils --test pokemon houndstone_last_respects
• cargo test --features test-utils --test pokemon klefki_dismantling_keys
• cargo clippy --lib --features test-utils -- -D warnings
• cargo run --bin card_status -- --incomplete-only | Select-String -Pattern "Houndstone|Klefki|B2a 053|B1 120|B1 330"

Note: targeted Pokemon tests still print existing unused_mut warnings from unrelated legacy tests.

[bcollazo]

Boom! Awesome stuff!

Thank you for taking a stab at this. And thanks for the great tests, particularly fond of the Klefi into Giant Cape KO one. Thanks! 🙌💯🚀🔥

[bcollazo]

How did you hear about the project? Are you on our Discord? You should join!

Great contribution this one. 💪💪