fix(cli): avoid duplicate Zsh positional completion

packages/cli/test/completions.test.ts

@@ -0,0 +1,15 @@
+import { expect, test } from "bun:test"
+import path from "node:path"
+
+test("zsh completion does not define the first positional twice", async () => {
+  const proc = Bun.spawn([process.execPath, path.join(import.meta.dir, "../src/index.ts"), "--completions", "zsh"], {
+    stdout: "pipe",
+    stderr: "pipe",
+  })
+  const output = await new Response(proc.stdout).text()
+  const error = await new Response(proc.stderr).text()
+
+  expect(await proc.exited, error).toBe(0)
+  expect(output).toContain("'1:command:->command'")
+  expect(output).not.toContain("':Directory to start OpenCode in:'")
+})

patches/effect@4.0.0-beta.83.patch

@@ -55,3 +55,31 @@ index f2920365cf0328146523ce2e2dba04d6a8809a4a..5482d635cdf01a72063ff683d244fab8
  /**
   * Creates a streaming `Uint8Array` success response schema.
   *
+diff --git a/dist/unstable/cli/internal/completions/zsh.js b/dist/unstable/cli/internal/completions/zsh.js
+--- a/dist/unstable/cli/internal/completions/zsh.js
++++ b/dist/unstable/cli/internal/completions/zsh.js
+@@ -102,9 +102,7 @@ const generateFunction = (descriptor, parentPath, lines) => {
+         lines.push(`    ${spec}`);
+       }
+     }
+-    for (const arg of descriptor.arguments) {
+-      lines.push(`    ${argSpec(arg)}`);
+-    }
++    // Positional specs conflict with the explicit first-position subcommand dispatcher in Zsh.
+     lines.push(`    '1:command:->command'`);
+     lines.push(`    '*::arg:->args'`);
+     lines.push(`  )`);
+diff --git a/src/unstable/cli/internal/completions/zsh.ts b/src/unstable/cli/internal/completions/zsh.ts
+--- a/src/unstable/cli/internal/completions/zsh.ts
++++ b/src/unstable/cli/internal/completions/zsh.ts
+@@ -133,9 +133,7 @@ const generateFunction = (
+         lines.push(`    ${spec}`)
+       }
+     }
+-    for (const arg of descriptor.arguments) {
+-      lines.push(`    ${argSpec(arg)}`)
+-    }
++    // Positional specs conflict with the explicit first-position subcommand dispatcher in Zsh.
+     lines.push(`    '1:command:->command'`)
+     lines.push(`    '*::arg:->args'`)
+     lines.push(`  )`)