fix(claude-code-command-loader): skip EXCLUDED_DIRS and memoize per directory

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/features/claude-code-command-loader/loader-cache.ts

@@ -0,0 +1,37 @@
+import { promises as fs } from "fs"
+import { resolve } from "path"
+
+import type { CommandDefinition } from "./types"
+
+const commandLoaderCache = new Map<string, Promise<Record<string, CommandDefinition>>>()
+
+export async function getCommandLoaderCacheKey(directory?: string): Promise<string> {
+  const resolvedDirectory = resolve(directory ?? process.cwd())
+
+  try {
+    return await fs.realpath(resolvedDirectory)
+  } catch {
+    return resolvedDirectory
+  }
+}
+
+export function getCachedCommands(
+  cacheKey: string,
+): Promise<Record<string, CommandDefinition>> | undefined {
+  return commandLoaderCache.get(cacheKey)
+}
+
+export function setCachedCommands(
+  cacheKey: string,
+  commands: Promise<Record<string, CommandDefinition>>,
+): void {
+  commandLoaderCache.set(cacheKey, commands)
+}
+
+export function deleteCachedCommands(cacheKey: string): void {
+  commandLoaderCache.delete(cacheKey)
+}
+
+export function clearCommandLoaderCache(): void {
+  commandLoaderCache.clear()
+}