refactor: extract shared utilities (isMarkdownFile, isPlainObject, resolveSymlink) (#33)

src/features/claude-code-agent-loader/loader.ts

@@ -3,6 +3,7 @@ import { homedir } from "os"
 import { join, basename } from "path"
 import type { AgentConfig } from "@opencode-ai/sdk"
 import { parseFrontmatter } from "../../shared/frontmatter"
+import { isMarkdownFile } from "../../shared/file-utils"
 import type { AgentScope, AgentFrontmatter, LoadedAgent } from "./types"
 
 function parseToolsConfig(toolsStr?: string): Record<string, boolean> | undefined {
@@ -18,10 +19,6 @@ function parseToolsConfig(toolsStr?: string): Record<string, boolean> | undefine
   return result
 }
 
-function isMarkdownFile(entry: { name: string; isFile: () => boolean }): boolean {
-  return !entry.name.startsWith(".") && entry.name.endsWith(".md") && entry.isFile()
-}
-
 function loadAgentsFromDir(agentsDir: string, scope: AgentScope): LoadedAgent[] {
   if (!existsSync(agentsDir)) {
     return []