fix(slashcommand): discover nested opencode commands with slash names

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

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

src/tools/slashcommand/opencode-project-command-discovery.test.ts

@@ -0,0 +1,60 @@
+import { execFileSync } from "node:child_process"
+import { afterEach, beforeEach, describe, expect, it } from "bun:test"
+import { mkdtempSync, mkdirSync, rmSync, writeFileSync } from "node:fs"
+import { tmpdir } from "node:os"
+import { join } from "node:path"
+import { discoverCommandsSync } from "./command-discovery"
+
+function writeCommand(path: string, description: string, body: string): void {
+  mkdirSync(join(path, ".."), { recursive: true })
+  writeFileSync(path, `---\ndescription: ${description}\n---\n${body}\n`)
+}
+
+describe("opencode project command discovery", () => {
+  let tempDir = ""
+
+  beforeEach(() => {
+    tempDir = mkdtempSync(join(tmpdir(), "omo-opencode-project-command-discovery-"))
+  })
+
+  afterEach(() => {
+    rmSync(tempDir, { recursive: true, force: true })
+  })
+
+  it("discovers ancestor opencode commands with slash-separated nested names and worktree boundaries", () => {
+    // given
+    const repositoryDir = join(tempDir, "repo")
+    const nestedDirectory = join(repositoryDir, "packages", "app", "src")
+
+    mkdirSync(nestedDirectory, { recursive: true })
+    execFileSync("git", ["init"], {
+      cwd: repositoryDir,
+      stdio: ["ignore", "ignore", "ignore"],
+    })
+
+    writeCommand(
+      join(repositoryDir, ".opencode", "commands", "deploy", "staging.md"),
+      "Deploy to staging",
+      "Run the staged deploy.",
+    )
+    writeCommand(
+      join(repositoryDir, ".opencode", "command", "release.md"),
+      "Release command",
+      "Run the release.",
+    )
+    writeCommand(
+      join(tempDir, ".opencode", "commands", "outside.md"),
+      "Outside command",
+      "Should not be discovered.",
+    )
+
+    // when
+    const names = discoverCommandsSync(nestedDirectory).map(command => command.name)
+
+    // then
+    expect(names).toContain("deploy/staging")
+    expect(names).toContain("release")
+    expect(names).not.toContain("deploy:staging")
+    expect(names).not.toContain("outside")
+  })
+})