feat(simulation): implement content loader Phase 2 (#408)
Extend content loader to read and instantiate real YAML content into ECS entities. 2-phase spawn pipeline: Phase 1 creates entities with core components (Want, Tolerance, Contentment, Personality, Tells, Skills), Phase 2 resolves cross-references (Relationships, Secrets, Information via KnowledgeGraph, DailyRoutine). Loads enums, entity attributes, pools, templates, triangles, and NPC profiles. Handles stub files gracefully. 7 integration tests against real content files plus edge case tests for invalid data. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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