test(slashcommand): isolate command discovery mocks

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

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

src/hooks/auto-slash-command/executor-resolution.test.ts

@@ -1,8 +1,9 @@
+/// <reference types="bun-types" />
+
 import { afterEach, describe, expect, it, spyOn } from "bun:test"
 import type { LoadedSkill } from "../../features/opencode-skill-loader"
 import * as shared from "../../shared"
-import * as slashcommand from "../../tools/slashcommand"
-import { executeSlashCommand } from "./executor"
+import * as slashcommand from "../../tools/slashcommand/command-discovery"
 
 let resolveCommandsInTextSpy: { mockRestore: () => void } | undefined
 let resolveFileReferencesInTextSpy: { mockRestore: () => void } | undefined
@@ -38,6 +39,11 @@ function restoreExecutorSpies(): void {
   discoverCommandsSyncSpy = undefined
 }
 
+async function executeSlashCommand(...args: Parameters<typeof import("./executor").executeSlashCommand>): ReturnType<typeof import("./executor").executeSlashCommand> {
+  const module = await import(`./executor?test=${Date.now()}-${Math.random()}`)
+  return module.executeSlashCommand(...args)
+}
+
 afterEach(restoreExecutorSpies)
 
 function createRestrictedSkill(): LoadedSkill {