feat(FN-3321): add agent self-improvement service and heartbeat evaluation

This merge delivers agent self-improvement (FN-3321) — adding evaluation identity tools, wiring evaluation into the heartbeat loop, implementing a self-improvement service, and providing test coverage. It also expands the dashboard guide view with regression tests, adds org chart full-view mode with

Fusion-Task-Id: FN-3321

packages/engine/src/index.ts

@@ -55,6 +55,7 @@ export {
   type SkillDiagnostic,
 } from "./skill-resolver.js";
 export { AgentReflectionService, type AgentReflectionServiceOptions } from "./agent-reflection.js";
+export { AgentSelfImproveService, type AgentSelfImproveServiceOptions } from "./agent-self-improve.js";
 export {
   buildAgentChatPrompt,
   resolveAgentInstructionsWithRatings,