- Fix critical name collision: shuffle+pop for unique NPC names (#3) - Validate population_density >= 1 in generator and validator (#4) - Guard against empty given_names/roles with validator warnings (#5) - Extract filler word cap to MAX_FILLER_WORDS constant (#6) - Fix cultural behavior gate checking wrong field (#7) - Document intentional one-directional relationships (#8) - Validate min_npcs <= max_npcs in validator (#9) - Fix validate-ron script realpath error handling (#10) - Add TODO comments for spike-specific code duplication (#11, #12, #13) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>