Implement Field Blower trainer card functionality

[bcollazo]

Summary

This PR adds support for the Field Blower trainer card, which allows a player to discard either a tool attached to any Pokémon (from either player) or the active stadium card.

Key Changes

• New action types: Added DiscardToolFromPokemon and DiscardActiveStadium to SimpleAction enum to represent Field Blower's effects
• Move generation: Implemented can_play_field_blower() to validate that Field Blower can only be played when there's at least one Pokémon with an attached tool or an active stadium in play
• Effect implementation: Added field_blower_effect() to generate choice actions for the player, offering to discard each available tool and/or the stadium
• Action application: Implemented handlers in apply_deterministic_action() to execute the discard operations on the game state
• AI support: Added weight assignments for the new actions in the weighted random player
• Comprehensive tests: Added two test cases covering:
  • Discarding an opponent's tool from their Pokémon
  • Discarding the active stadium card

Implementation Details

• Field Blower generates a list of all possible discard targets (tools on any in-play Pokémon from both players, plus the active stadium if present)
• The player must choose exactly one target to discard
• Tools are discarded to the tool owner's discard pile; stadiums are discarded to the playing player's discard pile
• The card properly validates playability before allowing it to be played

https://claude.ai/code/session_016QzTeF1hhQtayCcUXoKT4s