fix(slashcommand): use "commands" (plural) for OpenCode command directories

Closes #1918

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

@@ -0,0 +1,63 @@
+/// <reference types="bun-types" />
+
+import { afterEach, describe, expect, it } from "bun:test"
+import { mkdirSync, rmSync, writeFileSync } from "node:fs"
+import { tmpdir } from "node:os"
+import { join } from "node:path"
+import { executeSlashCommand } from "./executor"
+
+const testRoots: string[] = []
+
+function createTempRoot(): string {
+  const root = join(tmpdir(), `auto-slash-executor-${Date.now()}-${Math.random().toString(16).slice(2)}`)
+  mkdirSync(root, { recursive: true })
+  testRoots.push(root)
+  return root
+}
+
+function writeCommand(dir: string, name: string): void {
+  mkdirSync(dir, { recursive: true })
+  writeFileSync(
+    join(dir, `${name}.md`),
+    "---\ndescription: command from test\n---\nRun from OpenCode command directory"
+  )
+}
+
+afterEach(() => {
+  for (const root of testRoots.splice(0)) {
+    rmSync(root, { recursive: true, force: true })
+  }
+  delete process.env.OPENCODE_CONFIG_DIR
+})
+
+describe("auto-slash-command executor OpenCode paths", () => {
+  it("resolves commands from OpenCode global and project plural directories", async () => {
+    // given
+    const root = createTempRoot()
+    const opencodeConfigDir = join(root, "config")
+    writeCommand(join(opencodeConfigDir, "commands"), "global-cmd")
+    writeCommand(join(root, ".opencode", "commands"), "project-cmd")
+    process.env.OPENCODE_CONFIG_DIR = opencodeConfigDir
+
+    const originalCwd = process.cwd()
+    process.chdir(root)
+
+    try {
+      // when
+      const globalResult = await executeSlashCommand(
+        { command: "global-cmd", args: "", raw: "/global-cmd" },
+        { skills: [] }
+      )
+      const projectResult = await executeSlashCommand(
+        { command: "project-cmd", args: "", raw: "/project-cmd" },
+        { skills: [] }
+      )
+
+      // then
+      expect(globalResult.success).toBe(true)
+      expect(projectResult.success).toBe(true)
+    } finally {
+      process.chdir(originalCwd)
+    }
+  })
+})