Add schema for agent personas, parts, traits, and character arcs

- Created tables for agent_personas, agent_parts, agent_traits, and character_arcs.
- Established relationships between personas, parts, skills, guardrails, and traits.
- Added arc stages and their corresponding parts, along with a persona_arc table to track current stages.
- Implemented cascading delete rules for referential integrity.

internal/app/app.go

@@ -216,6 +216,7 @@ func routes(logger *slog.Logger, cfg *config.Config, info buildinfo.Info, db *st
 		RetryMetadata: tools.NewRetryEnrichmentTool(enrichmentRetryer),
 		//Maintenance:   tools.NewMaintenanceTool(db),
 		Skills:      tools.NewSkillsTool(db, activeProjects),
+		Personas:    tools.NewAgentPersonasTool(db),
 		ChatHistory: tools.NewChatHistoryTool(db, activeProjects),
 		Describe:    tools.NewDescribeTool(db, mcpserver.BuildToolCatalog()),
 	}