ge-hch.5.15.5: player preference integration

[SorraTheOrc]

Summary

• integrate player preference into director risk scoring with a player_preference weight
• add helper to fetch preference (config override, global PlayerPreference, default 0.5)
• add unit test covering PlayerPreference wiring and defaults

Testing

• npm run test:unit -- --runTestsByPath tests/unit/player-preference.test.js tests/unit/director.risk-preference.test.js

Closes bd#ge-hch.5.15.5