fix(slashcommand): discover ancestor opencode commands

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

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

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

@@ -181,4 +181,27 @@ Use parent opencode commit command.
     expect(commitCommand?.scope).toBe("opencode")
     expect(commitCommand?.content).toContain("Use parent opencode commit command.")
   })
+
+  it("discovers ancestor project opencode commands from plural commands directory", () => {
+    const projectRoot = join(projectDir, "workspace")
+    const childDir = join(projectRoot, "apps", "cli")
+    const commandsDir = join(projectRoot, ".opencode", "commands")
+
+    mkdirSync(childDir, { recursive: true })
+    mkdirSync(commandsDir, { recursive: true })
+    writeFileSync(
+      join(commandsDir, "ancestor.md"),
+      `---
+description: Discover command from ancestor plural directory
+---
+Use ancestor command.
+`,
+    )
+
+    const commands = discoverCommandsSync(childDir)
+    const ancestorCommand = commands.find((command) => command.name === "ancestor")
+
+    expect(ancestorCommand?.scope).toBe("opencode-project")
+    expect(ancestorCommand?.content).toContain("Use ancestor command.")
+  })
 })

src/tools/slashcommand/command-discovery.ts

@@ -3,6 +3,7 @@ import { basename, join } from "path"
 import {
   parseFrontmatter,
   sanitizeModelField,
+  findProjectOpencodeCommandDirs,
   getOpenCodeCommandDirs,
   discoverPluginCommandDefinitions,
 } from "../../shared"
@@ -82,14 +83,16 @@ export function discoverCommandsSync(
   const userCommandsDir = join(getClaudeConfigDir(), "commands")
   const projectCommandsDir = join(directory ?? process.cwd(), ".claude", "commands")
   const opencodeGlobalDirs = getOpenCodeCommandDirs({ binary: "opencode" })
-  const opencodeProjectDir = join(directory ?? process.cwd(), ".opencode", "command")
+  const opencodeProjectDirs = findProjectOpencodeCommandDirs(directory ?? process.cwd())
 
   const userCommands = discoverCommandsFromDir(userCommandsDir, "user")
   const opencodeGlobalCommands = opencodeGlobalDirs.flatMap((commandsDir) =>
     discoverCommandsFromDir(commandsDir, "opencode")
   )
   const projectCommands = discoverCommandsFromDir(projectCommandsDir, "project")
-  const opencodeProjectCommands = discoverCommandsFromDir(opencodeProjectDir, "opencode-project")
+  const opencodeProjectCommands = opencodeProjectDirs.flatMap((commandsDir) =>
+    discoverCommandsFromDir(commandsDir, "opencode-project"),
+  )
   const pluginCommands = discoverPluginCommands(options)
 
   const builtinCommandsMap = loadBuiltinCommands()