Add knowledge enricher and update playbooks

[arsenyinfo]

api.base_agent_session[35423] INFO Emitting intermediate message: 🎯 Generating application schema and types...
...
core.knowledge_enricher[35423] INFO selected 5 topics from 18 available: ['db_drizzle_setup', 'schema_numeric_types', 'schema_nullable_optional', 'schema_zod_basics', 'schema_type_alignment']
core.knowledge_enricher[35423] INFO enrichment added: 5798 characters, 51 lines
trpc_agent.actors[35423] INFO system prompt enriched: 2156 → 7956 chars (+5800)