Add observe_npc, hear_sound, observe_anomaly, witness_interaction, and
post_conversation triggers to monologue system. trigger_event_monologue
system fires after sound collection, NPC conversations, and walk-away.
Context tags (location, situation, character_state) populated for D-035
content pool matching. COOLDOWN_TICKS=300 anti-spam guard respected.
witness_interaction fires after overheard NPC-to-NPC conversation per
D-078. Voice sounds and ambient sounds correctly excluded from
hear_sound trigger.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>