chore(cli): replace console.log with logger and remove unused types

- Replace console.log with logger.debug in announceLoadedAgents
- Remove unused SubsetOf and SetElement types from types/utils.ts

Author: brandonkachen

cli/src/types/utils.ts

@@ -1,7 +1,3 @@
-export type SubsetOf<T, U extends T> = U
-
 export type Prettify<T> = {
   [K in keyof T]: T[K]
 } & {}
-
-export type SetElement<T extends Set<any>> = T extends Set<infer U> ? U : never

cli/src/utils/local-agent-registry.ts

@@ -320,25 +320,25 @@ export const announceLoadedAgents = (): void => {
   const agentsDir = findAgentsDirectory()
 
   if (!agentsDir) {
-    console.log('[agents] No .agents directory found in this project.')
+    logger.debug('[agents] No .agents directory found in this project.')
     return
   }
 
   if (!agents.length) {
-    console.log(`[agents] No agent files found in ${agentsDir}`)
+    logger.debug({ agentsDir }, '[agents] No agent files found')
     return
   }
 
-  console.log(
-    `[agents] Loaded ${pluralize(agents.length, 'local agent')} from ${agentsDir}`,
+  const agentIdentifiers = agents.map((agent) =>
+    agent.displayName && agent.displayName !== agent.id
+      ? `${agent.displayName} (${agent.id})`
+      : agent.displayName || agent.id,
+  )
+
+  logger.debug(
+    { agentsDir, agents: agentIdentifiers },
+    `[agents] Loaded ${pluralize(agents.length, 'local agent')}`,
   )
-  for (const agent of agents) {
-    const identifier =
-      agent.displayName && agent.displayName !== agent.id
-        ? `${agent.displayName} (${agent.id})`
-        : agent.displayName || agent.id
-    console.log(`  - ${identifier}`)
-  }
 }
 
 export const getLoadedAgentsMessage = (): string | null => {