Improve cold bot combat fidelity and scheduling

[pmbstyle]

Summary

• Simulate cold solo and party combat from the bot's real persisted skills, equipment, effects, and cooldowns.
• Let cold bots use combat skills and party healing instead of fighting as unprofiled actors.
• Move passive travel and rest states to deadline-driven resolution, and balance bounded background party formation.
• Safely migrate existing cold profiles after normal scheduler work and expose combat actions, skill uses, and heals in population telemetry.

Why

Cold bots previously relied on incomplete class-tree snapshots and repeatedly consumed scheduler work while inactive. This caused unrealistic combat outcomes and reduced available capacity for active bot behavior.

Validation

• npm test
• Live population run with the full migrated cold population: profile skills matched the persisted character skills, scheduler skips and overruns remained at zero, and combat telemetry recorded live actions and skill casts.