feat(runner): clone stage with ephemeral credential helper

Clone stage per tech spec §6, verbatim mechanics: every git invocation
carries a BLANK credential.helper first (suppresses OS keychain
helpers) then the inline veect helper; the PAT reaches git via child
env only — never argv, URLs, logs, or .git/config. GIT_TERMINAL_PROMPT
and GIT_ASKPASS are pinned so a headless clone can never hang on a TTY
or ambient IDE askpass. Staged status events (start/heartbeat/final) +
ready on success; named failures: invalid-git-url, auth-failed,
clone-failed (daemon's 'repository not exported' maps to bad-URL, not
auth). Integration suite clones the daemon-served vite-kitchen and an
authenticated dumb-HTTP remote that asserts the exact Basic credential
git presented, plus leak assertions over logs/argv/.git.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016j8z4VHjedXDTjEDNg7qHK

apps/runner/AGENTS.md

@@ -33,6 +33,36 @@ manifest, no use-case layer, no DI container.
 - Zod issues are summarized as path + code only — payload values (which
   may include a PAT) are never echoed into errors or logs.
 
+## Clone stage — credential mechanics (tech spec §6, verbatim)
+
+- Every git invocation carries `-c credential.helper=` (BLANK first —
+  resets the helper list, suppressing OS keychain helpers) followed by
+  `-c credential.helper=<veect-helper>` (an inline shell function that
+  answers `get` from env vars and ignores `store`/`erase`).
+- The PAT reaches git via the child's env (`VEECT_GIT_PAT`) — never
+  argv (the helper string only names env vars), never in the URL, never
+  written to `.git/config` or anywhere else on disk.
+- `GIT_TERMINAL_PROMPT=0` and `GIT_ASKPASS=echo` ride every invocation:
+  a clone must never hang on a TTY prompt or an ambient IDE askpass.
+- Failures map to named causes (`src/stages/clone.ts`): unusable URL /
+  unreachable repo → `invalid-git-url`, credential rejection →
+  `auth-failed`, anything else → `clone-failed`.
+
+### How the auth path is honestly tested
+
+`git daemon` (story 01's transport) has no authentication, so it cannot
+prove credential delivery. The integration suite therefore also serves
+the same bare fixture over **authenticated dumb HTTP**
+(`tests/http-git-server.ts`): a real `git clone` probes, receives 401,
+consults the ephemeral helper, and retries with Basic auth — the test
+asserts the server received exactly `x-access-token:<PAT>`, that git's
+first probe was unauthenticated, and that the PAT appears nowhere in
+runner logs (which include every spawned git argv), `.git/config`, or
+any other file under `.git/`. Wrong/missing PAT → named `auth-failed`.
+What is NOT covered: a real smart-HTTP provider (GitHub et al.) — the
+dumb-HTTP fallback exercises the same credential machinery in git, but
+the smart-protocol surface itself first meets reality in later PRDs.
+
 ## Testing
 
 - Unit suites live next to sources in `src/`; protocol/WS suites live in

apps/runner/src/exec.ts

@@ -0,0 +1,55 @@
+import { execFile } from "node:child_process";
+
+/**
+ * Minimal child-process runner shared by the stages. Array-args only —
+ * never a shell — so URLs and paths cannot be interpreted, and secrets
+ * can only travel via `env` (spec §6/§10).
+ */
+export interface CommandResult {
+  exitCode: number;
+  stdout: string;
+  stderr: string;
+}
+
+export type RunCommand = (
+  command: string,
+  args: string[],
+  options: { cwd: string; env?: Record<string, string> },
+) => Promise<CommandResult>;
+
+const MAX_OUTPUT_BYTES = 64 * 1024 * 1024;
+
+/** Ten minutes: covers a cold `npm install` of a real repo; prevents hangs. */
+const COMMAND_TIMEOUT_MS = 10 * 60 * 1000;
+
+export const runCommand: RunCommand = (command, args, options) =>
+  new Promise((resolve, reject) => {
+    execFile(
+      command,
+      args,
+      {
+        cwd: options.cwd,
+        env: { ...process.env, ...options.env },
+        maxBuffer: MAX_OUTPUT_BYTES,
+        timeout: COMMAND_TIMEOUT_MS,
+      },
+      (error, stdout, stderr) => {
+        if (error === null) {
+          resolve({ exitCode: 0, stdout, stderr });
+          return;
+        }
+        // Non-zero exit is a result, not an exception — stages map it to
+        // named protocol errors. Spawn-level failures still reject.
+        const exitCode = typeof error.code === "number" ? error.code : null;
+        if (exitCode !== null) {
+          resolve({ exitCode, stdout, stderr });
+          return;
+        }
+        if (error.killed === true) {
+          resolve({ exitCode: 124, stdout, stderr: `${stderr}\n(timed out)` });
+          return;
+        }
+        reject(error);
+      },
+    );
+  });

apps/runner/src/git/credential-helper.test.ts

@@ -0,0 +1,67 @@
+import { describe, expect, it } from "vitest";
+import {
+  buildCredentialHelperArgs,
+  buildCredentialHelperEnv,
+  PAT_ENV_VAR,
+  PAT_USERNAME,
+  USERNAME_ENV_VAR,
+  VEECT_CREDENTIAL_HELPER,
+} from "@/git/credential-helper";
+
+const PAT = "ghp_super-secret-token-123";
+
+describe("buildCredentialHelperArgs", () => {
+  it("passes the BLANK helper first to suppress OS keychain helpers (spec §6)", () => {
+    const args = buildCredentialHelperArgs(true);
+    expect(args.slice(0, 2)).toEqual(["-c", "credential.helper="]);
+  });
+
+  it("passes the veect helper second when a credential exists", () => {
+    const args = buildCredentialHelperArgs(true);
+    expect(args).toEqual([
+      "-c",
+      "credential.helper=",
+      "-c",
+      `credential.helper=${VEECT_CREDENTIAL_HELPER}`,
+    ]);
+  });
+
+  it("still suppresses OS helpers when no credential exists", () => {
+    expect(buildCredentialHelperArgs(false)).toEqual([
+      "-c",
+      "credential.helper=",
+    ]);
+  });
+
+  it("contains no secret material — only env var NAMES ride argv", () => {
+    // The helper string is argv-visible; it must reference the env vars
+    // by name and never embed a value.
+    expect(VEECT_CREDENTIAL_HELPER).toContain(`$${USERNAME_ENV_VAR}`);
+    expect(VEECT_CREDENTIAL_HELPER).toContain(`$${PAT_ENV_VAR}`);
+    expect(VEECT_CREDENTIAL_HELPER).toContain('"$1" = "get"');
+  });
+
+  it("answers get only — store/erase are no-ops so git can never persist", () => {
+    expect(VEECT_CREDENTIAL_HELPER).toMatch(
+      /^!f\(\) \{ if \[ "\$1" = "get" \]/,
+    );
+  });
+});
+
+describe("buildCredentialHelperEnv", () => {
+  it("carries the PAT via env, with the conventional PAT username", () => {
+    expect(buildCredentialHelperEnv(PAT)).toEqual({
+      GIT_TERMINAL_PROMPT: "0",
+      GIT_ASKPASS: "echo",
+      [USERNAME_ENV_VAR]: PAT_USERNAME,
+      [PAT_ENV_VAR]: PAT,
+    });
+  });
+
+  it("disables terminal prompts and neutralizes ambient askpass so a clone can never hang", () => {
+    expect(buildCredentialHelperEnv(undefined)).toEqual({
+      GIT_TERMINAL_PROMPT: "0",
+      GIT_ASKPASS: "echo",
+    });
+  });
+});

apps/runner/src/git/credential-helper.ts

@@ -0,0 +1,71 @@
+/**
+ * Ephemeral git credential helper — tech spec §6 mechanics, verbatim:
+ *
+ * Every git invocation the runner spawns carries, in order:
+ *
+ *   1. `-c credential.helper=` — a BLANK helper FIRST. An empty value
+ *      resets git's helper list, suppressing any OS-configured helpers
+ *      (keychain / credential manager) that could answer or cache the
+ *      credential.
+ *   2. `-c credential.helper=<veect-helper>` — an inline shell helper
+ *      that answers `get` by printing username/password sourced from the
+ *      spawned child's environment.
+ *
+ * The secret reaches git via env (`VEECT_GIT_PAT` on the child process),
+ * NEVER via argv — the helper string only names the env vars — and never
+ * embedded in the remote URL (URLs with tokens leak into `.git/config`
+ * and process lists). The helper ignores `store`/`erase`, so git can
+ * never persist the credential anywhere.
+ */
+
+/** Child-env variable the helper reads the PAT from. Never logged. */
+export const PAT_ENV_VAR = "VEECT_GIT_PAT";
+
+/** Child-env variable the helper reads the username from. */
+export const USERNAME_ENV_VAR = "VEECT_GIT_USERNAME";
+
+/**
+ * Username accompanying a PAT over HTTP basic auth. GitHub accepts any
+ * non-empty username for PATs; `x-access-token` is the conventional one.
+ */
+export const PAT_USERNAME = "x-access-token";
+
+/**
+ * The inline helper. Contains NO secret material — only the names of the
+ * env vars — so it is safe inside argv. git invokes it with
+ * `get`/`store`/`erase` as `$1`; everything but `get` is a no-op.
+ */
+export const VEECT_CREDENTIAL_HELPER = `!f() { if [ "$1" = "get" ]; then printf 'username=%s\\npassword=%s\\n' "$${USERNAME_ENV_VAR}" "$${PAT_ENV_VAR}"; fi; }; f`;
+
+/**
+ * `-c` args for one git invocation: blank suppressor always; the veect
+ * helper only when a credential exists to serve.
+ */
+export function buildCredentialHelperArgs(withCredential: boolean): string[] {
+  const args = ["-c", "credential.helper="];
+  if (withCredential) {
+    args.push("-c", `credential.helper=${VEECT_CREDENTIAL_HELPER}`);
+  }
+  return args;
+}
+
+/**
+ * Env additions for one git invocation. `GIT_TERMINAL_PROMPT=0` rides
+ * every invocation — a clone must never hang on a TTY prompt (spec §6) —
+ * and `GIT_ASKPASS=echo` overrides any ambient askpass program (IDE
+ * shells export e.g. VS Code's askpass, which would block a headless
+ * clone on GUI IPC): `echo <prompt>` answers with an empty credential,
+ * so a missing/denied credential fails fast instead of hanging. The
+ * veect helper always answers first when a PAT exists.
+ */
+export function buildCredentialHelperEnv(pat?: string): Record<string, string> {
+  const env: Record<string, string> = {
+    GIT_TERMINAL_PROMPT: "0",
+    GIT_ASKPASS: "echo",
+  };
+  if (pat !== undefined) {
+    env[USERNAME_ENV_VAR] = PAT_USERNAME;
+    env[PAT_ENV_VAR] = pat;
+  }
+  return env;
+}

apps/runner/src/server.ts

@@ -8,7 +8,10 @@ import {
   type RunnerMessage,
   type RunnerStage,
 } from "@repo/core-runner-protocol";
+import { runCommand } from "./exec";
 import type { Logger } from "./log";
+import { cloneRepository } from "./stages/clone";
+import { runStage, type StageEmitter } from "./stages/stage-runner";
 
 /**
  * The runner's WS protocol server (ADR-027, protocol version "0").
@@ -137,38 +140,59 @@ export type CommandMessage = Extract<
   { type: "clone" | "install" | "scan" | "adapter-start" | "render-frame" }
 >;
 
-export interface StageEmitter {
-  status: (stage: RunnerStage, elapsedMs: number) => void;
-  error: (
-    cause: RunnerErrorCause,
-    message: string,
-    stage?: RunnerStage,
-  ) => void;
-}
-
 /** Stages that later walking-skeleton stories wire up (05+). */
 const NOT_IMPLEMENTED: Record<
-  CommandMessage["type"],
+  Exclude<CommandMessage["type"], "clone">,
   { cause: RunnerErrorCause; stage?: RunnerStage }
 > = {
-  clone: { cause: "clone-failed", stage: "cloning" },
   install: { cause: "install-failed", stage: "installing" },
   scan: { cause: "scan-failed", stage: "scanning" },
   "adapter-start": { cause: "adapter-start-failed", stage: "starting-preview" },
   "render-frame": { cause: "render-failed" },
 };
 
+interface CommandContext {
+  emit: StageEmitter;
+  /** Signal successful command completion — the session's idle marker. */
+  ready: () => void;
+  options: RunnerServerOptions;
+}
+
 async function handleCommand(
   command: CommandMessage,
-  emit: StageEmitter,
-  _options: RunnerServerOptions,
+  ctx: CommandContext,
 ): Promise<void> {
-  const notImplemented = NOT_IMPLEMENTED[command.type];
-  emit.error(
-    notImplemented.cause,
-    `the "${command.type}" command is not implemented by this runner build yet`,
-    notImplemented.stage,
-  );
+  const { emit, options } = ctx;
+  const stageOptions = {
+    emit,
+    heartbeatMs: options.heartbeatMs,
+    log: options.log,
+  };
+  switch (command.type) {
+    case "clone": {
+      const result = await runStage(
+        "cloning",
+        "clone-failed",
+        stageOptions,
+        () =>
+          cloneRepository({
+            workspaceDir: options.workspaceDir,
+            runCommand,
+            log: options.log,
+          })(command),
+      );
+      if (result.ok) ctx.ready();
+      return;
+    }
+    default: {
+      const notImplemented = NOT_IMPLEMENTED[command.type];
+      emit.error(
+        notImplemented.cause,
+        `the "${command.type}" command is not implemented by this runner build yet`,
+        notImplemented.stage,
+      );
+    }
+  }
 }
 
 function rawToString(data: RawData): string {
@@ -257,7 +281,11 @@ export async function startRunnerServer(
       log.info("command-received", { command: command.type });
       commandChain = commandChain.then(async () => {
         try {
-          await handleCommand(command, emit, options);
+          await handleCommand(command, {
+            emit,
+            ready: () => send({ type: "ready" }),
+            options,
+          });
         } catch (error) {
           // Stages map their own failures; this is the last-resort net.
           log.error("command-crashed", {

apps/runner/src/stages/clone.test.ts

@@ -0,0 +1,247 @@
+import { mkdir, mkdtemp, writeFile } from "node:fs/promises";
+import { existsSync } from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import { describe, expect, it } from "vitest";
+import {
+  buildCloneInvocation,
+  cloneRepository,
+  mapCloneFailure,
+  repoPath,
+  validateGitUrl,
+} from "@/stages/clone";
+import { StageError } from "@/stages/stage-runner";
+import { PAT_ENV_VAR } from "@/git/credential-helper";
+import { createLogger } from "@/log";
+import type { CommandResult, RunCommand } from "@/exec";
+
+const PAT = "ghp_never-in-argv-or-config";
+
+function fakeRun(result: Partial<CommandResult>): {
+  run: RunCommand;
+  calls: unknown[][];
+} {
+  const calls: unknown[][] = [];
+  const run: RunCommand = async (...args) => {
+    calls.push(args);
+    return { exitCode: 0, stdout: "", stderr: "", ...result };
+  };
+  return { run, calls };
+}
+
+describe("validateGitUrl", () => {
+  it("accepts git, http(s), and file URLs", () => {
+    expect(validateGitUrl("git://127.0.0.1:9418/vite-kitchen.git")).toBeNull();
+    expect(validateGitUrl("https://github.com/acme/app.git")).toBeNull();
+    expect(validateGitUrl("http://127.0.0.1:8080/repo.git")).toBeNull();
+    expect(validateGitUrl("file:///tmp/fixture.git")).toBeNull();
+  });
+
+  it("rejects junk that is not a URL", () => {
+    expect(validateGitUrl("not a url at all")).toMatch(/not a valid URL/);
+  });
+
+  it("rejects protocols the runner does not clone from", () => {
+    expect(validateGitUrl("ssh://git@github.com/acme/app.git")).toMatch(
+      /unsupported protocol/,
+    );
+    expect(validateGitUrl("ftp://example.com/repo.git")).toMatch(
+      /unsupported protocol/,
+    );
+  });
+});
+
+describe("buildCloneInvocation", () => {
+  it("never places the PAT in argv — env is the only channel (spec §6)", () => {
+    const invocation = buildCloneInvocation(
+      "https://example.com/a.git",
+      "/ws/repo",
+      PAT,
+    );
+    expect(invocation.args.join(" ")).not.toContain(PAT);
+    expect(invocation.env[PAT_ENV_VAR]).toBe(PAT);
+  });
+
+  it("orders helpers blank-first and ends options with -- before the URL", () => {
+    const invocation = buildCloneInvocation(
+      "https://example.com/a.git",
+      "/ws/repo",
+      PAT,
+    );
+    const flat = invocation.args;
+    expect(flat.indexOf("credential.helper=")).toBeLessThan(
+      flat.findIndex((arg) => arg.startsWith("credential.helper=!f()")),
+    );
+    expect(flat.slice(-3)).toEqual([
+      "--",
+      "https://example.com/a.git",
+      "/ws/repo",
+    ]);
+  });
+
+  it("omits the veect helper (but keeps the suppressor) without a PAT", () => {
+    const invocation = buildCloneInvocation("git://h/a.git", "/ws/repo");
+    expect(
+      invocation.args.filter((arg) => arg.startsWith("credential.helper")),
+    ).toEqual(["credential.helper="]);
+    expect(invocation.env[PAT_ENV_VAR]).toBeUndefined();
+    expect(invocation.env.GIT_TERMINAL_PROMPT).toBe("0");
+  });
+});
+
+describe("mapCloneFailure", () => {
+  it.each([
+    // git daemon refuses a repo outside its export root — the URL is
+    // wrong, and "access denied" here must NOT read as an auth failure.
+    [
+      "fatal: remote error: access denied or repository not exported: /nope.git",
+      "invalid-git-url",
+    ],
+    ["fatal: repository 'https://x.test/a.git/' not found", "invalid-git-url"],
+    [
+      "fatal: unable to access 'https://x.test/a.git/': The requested URL returned error: 404",
+      "invalid-git-url",
+    ],
+    [
+      "fatal: unable to access 'https://gone.test/a.git/': Could not resolve host: gone.test",
+      "invalid-git-url",
+    ],
+    [
+      "fatal: '/tmp/missing.git' does not appear to be a git repository",
+      "invalid-git-url",
+    ],
+    ["fatal: Authentication failed for 'https://x.test/a.git/'", "auth-failed"],
+    [
+      "fatal: could not read Username for 'https://x.test': terminal prompts disabled",
+      "auth-failed",
+    ],
+    [
+      "fatal: unable to access 'https://x.test/a.git/': The requested URL returned error: 401",
+      "auth-failed",
+    ],
+    [
+      "fatal: unable to access 'https://x.test/a.git/': The requested URL returned error: 403",
+      "auth-failed",
+    ],
+    ["remote: Invalid username or password.", "auth-failed"],
+    ["fatal: the remote end hung up unexpectedly", "clone-failed"],
+    ["", "clone-failed"],
+  ])("maps %j to %s", (stderr, cause) => {
+    const error = mapCloneFailure(stderr);
+    expect(error).toBeInstanceOf(StageError);
+    expect(error.namedCause).toBe(cause);
+  });
+
+  it("keeps only a bounded single-line tail of stderr in the message", () => {
+    const error = mapCloneFailure(`line one\nline two\n${"x".repeat(1000)}`);
+    expect(error.message).not.toContain("\n");
+    expect(error.message.length).toBeLessThan(500);
+  });
+});
+
+describe("cloneRepository", () => {
+  it("rejects an invalid URL before ever spawning git", async () => {
+    const { run, calls } = fakeRun({});
+    const clone = cloneRepository({
+      workspaceDir: "/ws",
+      runCommand: run,
+      log: createLogger(() => undefined),
+    });
+
+    await expect(
+      clone({ type: "clone", gitUrl: "not a url" }),
+    ).rejects.toMatchObject({
+      namedCause: "invalid-git-url",
+    });
+    expect(calls).toHaveLength(0);
+  });
+
+  it("spawns git clone into <workspaceDir>/repo and resolves the dest", async () => {
+    const workspaceDir = await mkdtemp(
+      path.join(os.tmpdir(), "veect-clone-unit-"),
+    );
+    const { run, calls } = fakeRun({});
+    const clone = cloneRepository({
+      workspaceDir,
+      runCommand: run,
+      log: createLogger(() => undefined),
+    });
+
+    const dest = await clone({
+      type: "clone",
+      gitUrl: "git://h/a.git",
+      pat: PAT,
+    });
+
+    expect(dest).toBe(repoPath(workspaceDir));
+    expect(calls).toHaveLength(1);
+    const [command, args, options] = calls[0] as [
+      string,
+      string[],
+      { env: Record<string, string> },
+    ];
+    expect(command).toBe("git");
+    expect(args).toContain("clone");
+    expect(args.join(" ")).not.toContain(PAT);
+    expect(options.env[PAT_ENV_VAR]).toBe(PAT);
+  });
+
+  it("clears a stale <workspaceDir>/repo before cloning (idempotent retry)", async () => {
+    const workspaceDir = await mkdtemp(
+      path.join(os.tmpdir(), "veect-clone-unit-"),
+    );
+    const stale = path.join(repoPath(workspaceDir), "stale.txt");
+    await mkdir(repoPath(workspaceDir), { recursive: true });
+    await writeFile(stale, "old");
+    const { run } = fakeRun({});
+    const clone = cloneRepository({
+      workspaceDir,
+      runCommand: run,
+      log: createLogger(() => undefined),
+    });
+
+    await clone({ type: "clone", gitUrl: "git://h/a.git" });
+
+    expect(existsSync(stale)).toBe(false);
+  });
+
+  it("throws the mapped StageError when git exits non-zero", async () => {
+    const workspaceDir = await mkdtemp(
+      path.join(os.tmpdir(), "veect-clone-unit-"),
+    );
+    const { run } = fakeRun({
+      exitCode: 128,
+      stderr: "fatal: Authentication failed for 'https://x.test/a.git/'",
+    });
+    const clone = cloneRepository({
+      workspaceDir,
+      runCommand: run,
+      log: createLogger(() => undefined),
+    });
+
+    await expect(
+      clone({ type: "clone", gitUrl: "https://x.test/a.git" }),
+    ).rejects.toMatchObject({
+      namedCause: "auth-failed",
+    });
+  });
+
+  it("logs the spawned argv (secret-free) and never the PAT", async () => {
+    const workspaceDir = await mkdtemp(
+      path.join(os.tmpdir(), "veect-clone-unit-"),
+    );
+    const lines: string[] = [];
+    const { run } = fakeRun({});
+    const clone = cloneRepository({
+      workspaceDir,
+      runCommand: run,
+      log: createLogger((line) => lines.push(line)),
+    });
+
+    await clone({ type: "clone", gitUrl: "git://h/a.git", pat: PAT });
+
+    const logged = lines.join("\n");
+    expect(logged).toContain("git-spawn");
+    expect(logged).not.toContain(PAT);
+  });
+});

apps/runner/src/stages/clone.ts

@@ -0,0 +1,156 @@
+import { rm } from "node:fs/promises";
+import path from "node:path";
+import type { CloneMessage } from "@repo/core-runner-protocol";
+import {
+  buildCredentialHelperArgs,
+  buildCredentialHelperEnv,
+} from "../git/credential-helper";
+import type { RunCommand } from "../exec";
+import type { Logger } from "../log";
+import { StageError } from "./stage-runner";
+
+/** Where the workspace's clone lives: `<workspaceDir>/repo`. */
+export const REPO_DIR_NAME = "repo";
+
+export function repoPath(workspaceDir: string): string {
+  return path.join(workspaceDir, REPO_DIR_NAME);
+}
+
+/**
+ * Protocols the runner will clone from. SSH is deliberately absent for
+ * cloud runners (ADR-027 retires SSH-via-agent there); `file:` and
+ * `git:` exist for the fixture-serving integration suites.
+ */
+const ALLOWED_PROTOCOLS = new Set(["git:", "http:", "https:", "file:"]);
+
+/** Returns a human-readable rejection, or null when the URL is usable. */
+export function validateGitUrl(gitUrl: string): string | null {
+  let url: URL;
+  try {
+    url = new URL(gitUrl);
+  } catch {
+    return `"${gitUrl}" is not a valid URL`;
+  }
+  if (!ALLOWED_PROTOCOLS.has(url.protocol)) {
+    return `unsupported protocol "${url.protocol}" (allowed: git:, http:, https:, file:)`;
+  }
+  return null;
+}
+
+export interface GitInvocation {
+  /** argv for `git` — contains no secret material by construction. */
+  args: string[];
+  /** Env additions for the child — the only channel a PAT travels on. */
+  env: Record<string, string>;
+}
+
+/**
+ * Build the clone invocation per spec §6/§10: blank-then-veect
+ * credential helpers, array args, `--` end-of-options, credential via
+ * child env only.
+ */
+export function buildCloneInvocation(
+  gitUrl: string,
+  dest: string,
+  pat?: string,
+): GitInvocation {
+  return {
+    args: [
+      ...buildCredentialHelperArgs(pat !== undefined),
+      "clone",
+      "--",
+      gitUrl,
+      dest,
+    ],
+    env: buildCredentialHelperEnv(pat),
+  };
+}
+
+/**
+ * Ordering matters: the bad-URL signatures are checked first because
+ * `git daemon`'s "access denied or repository not exported" would
+ * otherwise false-positive the auth patterns; over the git protocol
+ * there is no authentication at all.
+ */
+const BAD_URL_PATTERNS: RegExp[] = [
+  /repository not exported/i, // git daemon: not-exported path
+  /repository .* not found/i,
+  /returned error: 404/i,
+  /could not resolve host/i,
+  /does not appear to be a git repository/i,
+  /no such file or directory/i, // file:// to a missing path
+  /protocol .* is not supported/i,
+];
+
+const AUTH_FAILURE_PATTERNS: RegExp[] = [
+  /authentication failed/i,
+  /invalid username or password/i,
+  /could not read username/i,
+  /could not read password/i,
+  /returned error: 401/i,
+  /returned error: 403/i,
+  /access denied/i,
+];
+
+/** Trimmed single-line tail of git's stderr for the protocol error message. */
+function stderrTail(stderr: string): string {
+  const flat = stderr
+    .trim()
+    .split("\n")
+    .map((l) => l.trim())
+    .filter(Boolean)
+    .join(" | ");
+  return flat.length > 400 ? `…${flat.slice(-400)}` : flat;
+}
+
+/** Map a failed `git clone` to a named protocol cause (PRD user story 5). */
+export function mapCloneFailure(stderr: string): StageError {
+  const detail = stderrTail(stderr) || "git clone failed with no output";
+  if (BAD_URL_PATTERNS.some((pattern) => pattern.test(stderr))) {
+    return new StageError(
+      "invalid-git-url",
+      `git could not reach the repository: ${detail}`,
+    );
+  }
+  if (AUTH_FAILURE_PATTERNS.some((pattern) => pattern.test(stderr))) {
+    return new StageError(
+      "auth-failed",
+      `git authentication failed: ${detail}`,
+    );
+  }
+  return new StageError("clone-failed", `git clone failed: ${detail}`);
+}
+
+export interface CloneStageDeps {
+  workspaceDir: string;
+  runCommand: RunCommand;
+  log: Logger;
+}
+
+/**
+ * The clone stage: validate URL → reset `<workspaceDir>/repo` (idempotent
+ * retry) → `git clone` with the ephemeral credential helper. Throws
+ * `StageError` with a named cause on every failure path.
+ */
+export function cloneRepository(deps: CloneStageDeps) {
+  return async (message: CloneMessage): Promise<string> => {
+    const rejection = validateGitUrl(message.gitUrl);
+    if (rejection !== null) {
+      throw new StageError("invalid-git-url", rejection);
+    }
+    const dest = repoPath(deps.workspaceDir);
+    await rm(dest, { recursive: true, force: true });
+    const invocation = buildCloneInvocation(message.gitUrl, dest, message.pat);
+    // argv is secret-free by construction; logging it lets the
+    // integration suite grep the spawned invocation for leaks (spec §15).
+    deps.log.info("git-spawn", { args: invocation.args });
+    const result = await deps.runCommand("git", invocation.args, {
+      cwd: deps.workspaceDir,
+      env: invocation.env,
+    });
+    if (result.exitCode !== 0) {
+      throw mapCloneFailure(result.stderr);
+    }
+    return dest;
+  };
+}

apps/runner/src/stages/stage-runner.test.ts

@@ -0,0 +1,115 @@
+import { describe, expect, it } from "vitest";
+import type { RunnerErrorCause, RunnerStage } from "@repo/core-runner-protocol";
+import { runStage, StageError, type StageEmitter } from "@/stages/stage-runner";
+import { createLogger } from "@/log";
+
+interface Recorded {
+  statuses: { stage: RunnerStage; elapsedMs: number }[];
+  errors: { cause: RunnerErrorCause; message: string; stage?: RunnerStage }[];
+}
+
+function recordingEmitter(): { emit: StageEmitter; recorded: Recorded } {
+  const recorded: Recorded = { statuses: [], errors: [] };
+  return {
+    recorded,
+    emit: {
+      status: (stage, elapsedMs) =>
+        recorded.statuses.push({ stage, elapsedMs }),
+      error: (cause, message, stage) =>
+        recorded.errors.push({ cause, message, stage }),
+    },
+  };
+}
+
+function options(emit: StageEmitter, heartbeatMs = 10_000) {
+  return { emit, heartbeatMs, log: createLogger(() => undefined) };
+}
+
+const delay = (ms: number) => new Promise((resolve) => setTimeout(resolve, ms));
+
+describe("runStage", () => {
+  it("emits a start status (0ms) and a final status on success", async () => {
+    const { emit, recorded } = recordingEmitter();
+    const result = await runStage(
+      "cloning",
+      "clone-failed",
+      options(emit),
+      async () => 42,
+    );
+
+    expect(result).toEqual({ ok: true, value: 42 });
+    expect(recorded.errors).toEqual([]);
+    expect(recorded.statuses.length).toBeGreaterThanOrEqual(2);
+    expect(recorded.statuses[0]).toEqual({ stage: "cloning", elapsedMs: 0 });
+    const last = recorded.statuses.at(-1);
+    expect(last?.stage).toBe("cloning");
+    expect(last?.elapsedMs).toBeGreaterThanOrEqual(0);
+  });
+
+  it("streams heartbeat statuses with nondecreasing elapsedMs while work runs", async () => {
+    const { emit, recorded } = recordingEmitter();
+    await runStage("installing", "install-failed", options(emit, 20), () =>
+      delay(150),
+    );
+
+    expect(recorded.statuses.length).toBeGreaterThanOrEqual(4);
+    const elapsed = recorded.statuses.map((s) => s.elapsedMs);
+    expect([...elapsed].sort((a, b) => a - b)).toEqual(elapsed);
+    expect(recorded.statuses.every((s) => s.stage === "installing")).toBe(true);
+  });
+
+  it("stops heartbeats once the stage completes", async () => {
+    const { emit, recorded } = recordingEmitter();
+    await runStage(
+      "cloning",
+      "clone-failed",
+      options(emit, 10),
+      async () => "done",
+    );
+    const count = recorded.statuses.length;
+    await delay(60);
+    expect(recorded.statuses.length).toBe(count);
+  });
+
+  it("maps a StageError to its named cause with the failing stage", async () => {
+    const { emit, recorded } = recordingEmitter();
+    const result = await runStage(
+      "cloning",
+      "clone-failed",
+      options(emit),
+      async () => {
+        throw new StageError("invalid-git-url", "nope");
+      },
+    );
+
+    expect(result).toEqual({ ok: false });
+    expect(recorded.errors).toEqual([
+      { cause: "invalid-git-url", message: "nope", stage: "cloning" },
+    ]);
+  });
+
+  it("maps an unexpected throw to the stage's fallback cause", async () => {
+    const { emit, recorded } = recordingEmitter();
+    const result = await runStage(
+      "installing",
+      "install-failed",
+      options(emit),
+      async () => {
+        throw new Error("ECONNRESET");
+      },
+    );
+
+    expect(result).toEqual({ ok: false });
+    expect(recorded.errors).toEqual([
+      { cause: "install-failed", message: "ECONNRESET", stage: "installing" },
+    ]);
+  });
+
+  it("stringifies non-Error throws", async () => {
+    const { emit, recorded } = recordingEmitter();
+    await runStage("cloning", "clone-failed", options(emit), async () => {
+      throw "raw string";
+    });
+    expect(recorded.errors[0]?.message).toBe("raw string");
+  });
+});

apps/runner/src/stages/stage-runner.ts

@@ -0,0 +1,67 @@
+import type { RunnerErrorCause, RunnerStage } from "@repo/core-runner-protocol";
+import type { Logger } from "../log";
+
+/** A stage failure that already knows its named protocol cause. */
+export class StageError extends Error {
+  readonly namedCause: RunnerErrorCause;
+
+  constructor(namedCause: RunnerErrorCause, message: string) {
+    super(message);
+    this.name = "StageError";
+    this.namedCause = namedCause;
+  }
+}
+
+/** How a stage talks back to the connected client. */
+export interface StageEmitter {
+  status: (stage: RunnerStage, elapsedMs: number) => void;
+  error: (
+    cause: RunnerErrorCause,
+    message: string,
+    stage?: RunnerStage,
+  ) => void;
+}
+
+export interface StageRunOptions {
+  emit: StageEmitter;
+  heartbeatMs: number;
+  log: Logger;
+}
+
+export type StageResult<T> = { ok: true; value: T } | { ok: false };
+
+/**
+ * Run one stage with staged, honest progress (ui-gap §5): a `status` at
+ * start (elapsedMs 0), heartbeat `status` events while the work runs, a
+ * final `status` with the total elapsed on success. On failure, emits
+ * one named `error` event (`StageError` carries the cause; anything else
+ * maps to `fallbackCause`) — never a blank board.
+ */
+export async function runStage<T>(
+  stage: RunnerStage,
+  fallbackCause: RunnerErrorCause,
+  options: StageRunOptions,
+  work: () => Promise<T>,
+): Promise<StageResult<T>> {
+  const startedAt = Date.now();
+  const elapsed = (): number => Math.max(0, Math.round(Date.now() - startedAt));
+  options.emit.status(stage, 0);
+  const heartbeat = setInterval(() => {
+    options.emit.status(stage, elapsed());
+  }, options.heartbeatMs);
+  try {
+    const value = await work();
+    options.emit.status(stage, elapsed());
+    options.log.info("stage-complete", { stage, elapsedMs: elapsed() });
+    return { ok: true, value };
+  } catch (error) {
+    const cause =
+      error instanceof StageError ? error.namedCause : fallbackCause;
+    const message = error instanceof Error ? error.message : String(error);
+    options.log.error("stage-failed", { stage, cause });
+    options.emit.error(cause, message, stage);
+    return { ok: false };
+  } finally {
+    clearInterval(heartbeat);
+  }
+}

apps/runner/tests/clone-stage.integration.test.ts

@@ -0,0 +1,272 @@
+/**
+ * Clone-stage integration suite: real WS protocol session, real `git`
+ * subprocesses, real transports.
+ *
+ * Transport per concern:
+ * - `git daemon` (story 01's helper) proves the primary clone path and
+ *   the named bad-URL failure — the git protocol has NO authentication,
+ *   so it cannot prove credential delivery.
+ * - An authenticated dumb-HTTP server over the same bare repo proves the
+ *   ephemeral-credential-helper mechanics end to end: git receives a 401,
+ *   consults the helper, retries with Basic auth — and the server records
+ *   exactly which credential arrived. Success with the right PAT + the
+ *   named `auth-failed` failure with a wrong/missing PAT.
+ *
+ * Credential-leak assertions (spec §15) ride the success path: the PAT
+ * must appear nowhere in the runner's logs (which include every spawned
+ * git argv), nowhere under the clone's `.git/config`, and nowhere in the
+ * clone's stored remote URL.
+ */
+import { existsSync } from "node:fs";
+import { mkdtemp, readdir, readFile, rm } from "node:fs/promises";
+import os from "node:os";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+import {
+  afterAll,
+  afterEach,
+  beforeAll,
+  beforeEach,
+  describe,
+  expect,
+  it,
+} from "vitest";
+import {
+  serveFixtureRepo,
+  type ServedFixtureRepo,
+} from "@repo/core-testing/git";
+import { startRunnerServer, type RunnerServer } from "@/server";
+import { createLogger } from "@/log";
+import { repoPath } from "@/stages/clone";
+import { PAT_USERNAME } from "@/git/credential-helper";
+import {
+  connectProtocolClient,
+  expectNamedError,
+  handshake,
+  sendAndAwaitReady,
+  type ProtocolClient,
+} from "./protocol-client";
+import {
+  serveBareRepoOverHttp,
+  type AuthedGitHttpServer,
+} from "./http-git-server";
+
+const TOKEN = "clone-suite-token";
+const PAT = "ghp_integration-pat-7f3a9";
+
+/** repo-root/fixtures/vite-kitchen, resolved from this file's location. */
+const FIXTURE_DIR = path.resolve(
+  path.dirname(fileURLToPath(import.meta.url)),
+  "../../../fixtures/vite-kitchen",
+);
+
+let served: ServedFixtureRepo;
+
+beforeAll(async () => {
+  // One served fixture for the whole suite (cheap teardown per test is
+  // the runner server, not the daemon).
+  served = await serveFixtureRepo(FIXTURE_DIR);
+});
+
+afterAll(async () => {
+  await served.stop();
+});
+
+let server: RunnerServer;
+let workspaceDir: string;
+let logLines: string[];
+let clients: ProtocolClient[];
+
+async function startSession(): Promise<ProtocolClient> {
+  workspaceDir = await mkdtemp(path.join(os.tmpdir(), "veect-clone-int-"));
+  logLines = [];
+  server = await startRunnerServer({
+    host: "127.0.0.1",
+    port: 0,
+    token: TOKEN,
+    workspaceDir,
+    heartbeatMs: 100,
+    log: createLogger((line) => logLines.push(line)),
+  });
+  const client = await connectProtocolClient(server.port, TOKEN);
+  clients.push(client);
+  await handshake(client);
+  return client;
+}
+
+beforeEach(() => {
+  clients = [];
+});
+
+afterEach(async () => {
+  for (const client of clients) client.close();
+  await server.close();
+  await rm(workspaceDir, { recursive: true, force: true });
+});
+
+/** Every file under the clone's .git that could persist a credential. */
+async function gitDirLeakSurface(cloneDir: string): Promise<string> {
+  const gitDir = path.join(cloneDir, ".git");
+  const parts: string[] = [];
+  const walk = async (dir: string): Promise<void> => {
+    for (const entry of await readdir(dir, { withFileTypes: true })) {
+      const full = path.join(dir, entry.name);
+      if (entry.isDirectory()) {
+        if (entry.name === "objects") continue; // packfiles: binary repo data
+        await walk(full);
+      } else {
+        parts.push(await readFile(full, "utf8").catch(() => ""));
+      }
+    }
+  };
+  await walk(gitDir);
+  return parts.join("\n");
+}
+
+/**
+ * Leak assertions (spec §15): the PAT must appear nowhere in the runner
+ * logs (which include every spawned git argv), the clone's
+ * `.git/config`, or any other file under `.git/`.
+ */
+async function expectNoCredentialLeak(cloneDir: string): Promise<void> {
+  expect(logLines.join("\n")).not.toContain(PAT);
+  const gitConfig = await readFile(
+    path.join(cloneDir, ".git", "config"),
+    "utf8",
+  );
+  expect(gitConfig).not.toContain(PAT);
+  expect(await gitDirLeakSurface(cloneDir)).not.toContain(PAT);
+}
+
+describe("clone via git daemon (primary transport)", () => {
+  it("clones vite-kitchen with staged progress and no credential leakage", async () => {
+    const client = await startSession();
+    // A PAT is supplied even though the git protocol never asks for it —
+    // the helper env rides the invocation, so the leak assertions below
+    // are exercised against a real spawned git.
+    await sendAndAwaitReady(
+      client,
+      { type: "clone", gitUrl: served.cloneUrl, pat: PAT },
+      "clone completion",
+    );
+
+    // Staged, honest progress: first cloning status is 0ms; elapsed is
+    // nondecreasing; completion signalled by ready.
+    const statuses = client
+      .received()
+      .flatMap((m) => (m.type === "status" ? [m] : []));
+    expect(statuses.length).toBeGreaterThanOrEqual(2);
+    expect(statuses[0]).toEqual({
+      type: "status",
+      stage: "cloning",
+      elapsedMs: 0,
+    });
+    const elapsed = statuses.map((s) => s.elapsedMs);
+    expect([...elapsed].sort((a, b) => a - b)).toEqual(elapsed);
+
+    // The clone actually landed, and the stored remote URL is the
+    // credential-free URL, verbatim.
+    const cloneDir = repoPath(workspaceDir);
+    expect(existsSync(path.join(cloneDir, "package.json"))).toBe(true);
+    const gitConfig = await readFile(
+      path.join(cloneDir, ".git", "config"),
+      "utf8",
+    );
+    expect(gitConfig).toContain(served.cloneUrl);
+
+    await expectNoCredentialLeak(cloneDir);
+  });
+
+  it("emits the named invalid-git-url failure for a repo the daemon does not export", async () => {
+    const client = await startSession();
+    const base = served.cloneUrl.replace(/\/[^/]+$/, "");
+    client.send({
+      type: "clone",
+      gitUrl: `${base}/definitely-not-exported.git`,
+    });
+    const error = await expectNamedError(client, "invalid-git-url");
+    expect(error.stage).toBe("cloning");
+  });
+
+  it("emits the named invalid-git-url failure for a malformed URL without spawning git", async () => {
+    const client = await startSession();
+    client.send({ type: "clone", gitUrl: "not a url at all" });
+    const error = await expectNamedError(client, "invalid-git-url");
+    expect(error.stage).toBe("cloning");
+    expect(logLines.join("\n")).not.toContain("git-spawn");
+  });
+
+  it("keeps the session usable after a failed clone (corrected retry succeeds)", async () => {
+    const client = await startSession();
+    client.send({ type: "clone", gitUrl: "not a url at all" });
+    await expectNamedError(client, "invalid-git-url");
+    await sendAndAwaitReady(
+      client,
+      { type: "clone", gitUrl: served.cloneUrl },
+      "retried clone completion",
+    );
+    expect(existsSync(path.join(repoPath(workspaceDir), "package.json"))).toBe(
+      true,
+    );
+  });
+});
+
+describe("clone via authenticated HTTP (credential-helper mechanics)", () => {
+  let httpServer: AuthedGitHttpServer;
+
+  afterEach(async () => {
+    await httpServer.stop();
+  });
+
+  it("delivers the PAT to git via the ephemeral helper — and only via it", async () => {
+    httpServer = await serveBareRepoOverHttp(served.bareRepoPath, {
+      username: PAT_USERNAME,
+      password: PAT,
+    });
+    const client = await startSession();
+    await sendAndAwaitReady(
+      client,
+      { type: "clone", gitUrl: httpServer.cloneUrl, pat: PAT },
+      "authenticated clone completion",
+    );
+
+    // git's first probe is unauthenticated; the 401 made it consult the
+    // helper; the retried request carried exactly username:PAT.
+    expect(httpServer.unauthenticatedRequests()).toBeGreaterThanOrEqual(1);
+    const expected =
+      "Basic " + Buffer.from(`${PAT_USERNAME}:${PAT}`).toString("base64");
+    expect(httpServer.authorizationHeaders().length).toBeGreaterThanOrEqual(1);
+    expect(
+      httpServer.authorizationHeaders().every((header) => header === expected),
+    ).toBe(true);
+
+    // And the credential persisted nowhere.
+    await expectNoCredentialLeak(repoPath(workspaceDir));
+  });
+
+  it("emits the named auth-failed failure for a wrong PAT", async () => {
+    httpServer = await serveBareRepoOverHttp(served.bareRepoPath, {
+      username: PAT_USERNAME,
+      password: PAT,
+    });
+    const client = await startSession();
+    client.send({
+      type: "clone",
+      gitUrl: httpServer.cloneUrl,
+      pat: "wrong-pat",
+    });
+    const error = await expectNamedError(client, "auth-failed");
+    expect(error.stage).toBe("cloning");
+  });
+
+  it("emits the named auth-failed failure when the PAT is missing entirely", async () => {
+    httpServer = await serveBareRepoOverHttp(served.bareRepoPath, {
+      username: PAT_USERNAME,
+      password: PAT,
+    });
+    const client = await startSession();
+    client.send({ type: "clone", gitUrl: httpServer.cloneUrl });
+    const error = await expectNamedError(client, "auth-failed");
+    expect(error.stage).toBe("cloning");
+  });
+});

apps/runner/tests/http-git-server.ts

@@ -0,0 +1,107 @@
+import { execFile } from "node:child_process";
+import { once } from "node:events";
+import { createReadStream } from "node:fs";
+import { stat } from "node:fs/promises";
+import { createServer } from "node:http";
+import path from "node:path";
+import { promisify } from "node:util";
+
+const execFileAsync = promisify(execFile);
+
+/**
+ * Serve a bare repository over authenticated "dumb" HTTP.
+ *
+ * `git daemon` (story 01's default transport) has no authentication, so
+ * it cannot exercise the ephemeral-credential-helper path. This helper
+ * can: a plain static-file server over the bare repo (dumb git-HTTP
+ * protocol — enabled by running `git update-server-info`) that rejects
+ * every request lacking the expected HTTP Basic credential with a 401 +
+ * `WWW-Authenticate`. A real `git clone` against it performs the real
+ * credential dance: unauthenticated probe → 401 → git consults the
+ * configured credential helper → retry with Basic auth.
+ *
+ * Every received Authorization header is recorded, so tests can assert
+ * the exact credential git presented — i.e. that the PAT reached git
+ * through the helper (and only through it).
+ */
+export interface AuthedGitHttpServer {
+  /** Clone URL: `http://127.0.0.1:<port>/repo.git` */
+  cloneUrl: string;
+  /** Every Authorization header received, in order. */
+  authorizationHeaders: () => string[];
+  /** Count of requests that arrived with no Authorization header. */
+  unauthenticatedRequests: () => number;
+  stop: () => Promise<void>;
+}
+
+export async function serveBareRepoOverHttp(
+  bareRepoPath: string,
+  credentials: { username: string; password: string },
+): Promise<AuthedGitHttpServer> {
+  // Generate info/refs + objects/info/packs so the dumb protocol works.
+  await execFileAsync("git", ["update-server-info"], { cwd: bareRepoPath });
+
+  const expected =
+    "Basic " +
+    Buffer.from(`${credentials.username}:${credentials.password}`).toString(
+      "base64",
+    );
+  const received: string[] = [];
+  let unauthenticated = 0;
+
+  const server = createServer((req, res) => {
+    const auth = req.headers.authorization;
+    if (auth === undefined) {
+      unauthenticated += 1;
+    } else {
+      received.push(auth);
+    }
+    if (auth !== expected) {
+      res.writeHead(401, { "WWW-Authenticate": 'Basic realm="veect-fixture"' });
+      res.end("authentication required");
+      return;
+    }
+    const urlPath = decodeURIComponent((req.url ?? "/").split("?")[0] ?? "/");
+    const relative = urlPath.replace(/^\/repo\.git\/?/, "");
+    const file = path.resolve(bareRepoPath, relative);
+    if (!file.startsWith(path.resolve(bareRepoPath) + path.sep)) {
+      res.writeHead(403);
+      res.end();
+      return;
+    }
+    void stat(file).then(
+      (stats) => {
+        if (!stats.isFile()) {
+          res.writeHead(404);
+          res.end();
+          return;
+        }
+        res.writeHead(200, { "content-type": "application/octet-stream" });
+        createReadStream(file).pipe(res);
+      },
+      () => {
+        res.writeHead(404);
+        res.end();
+      },
+    );
+  });
+
+  server.listen(0, "127.0.0.1");
+  await once(server, "listening");
+  const address = server.address();
+  if (address === null || typeof address === "string") {
+    server.close();
+    throw new Error("serveBareRepoOverHttp: could not determine a port");
+  }
+
+  return {
+    cloneUrl: `http://127.0.0.1:${address.port}/repo.git`,
+    authorizationHeaders: () => [...received],
+    unauthenticatedRequests: () => unauthenticated,
+    stop: () =>
+      new Promise((resolve, reject) => {
+        server.closeAllConnections();
+        server.close((error) => (error ? reject(error) : resolve()));
+      }),
+  };
+}

apps/runner/tests/protocol-client.ts

@@ -115,6 +115,32 @@ export async function handshake(
   return client.waitFor((m) => m.type === "ready", "ready handshake reply");
 }
 
+/**
+ * Send a command and resolve on the runner's NEXT `ready` — the
+ * protocol's success marker for a completed command. Counting readies
+ * (instead of matching any `ready`) keeps this correct on sessions that
+ * already completed earlier commands.
+ */
+export async function sendAndAwaitReady(
+  client: ProtocolClient,
+  message: RunnerMessage,
+  description: string,
+  timeoutMs?: number,
+): Promise<void> {
+  const readiesBefore = client
+    .received()
+    .filter((m) => m.type === "ready").length;
+  client.send(message);
+  await client.waitFor(
+    (m) =>
+      m.type === "ready" &&
+      client.received().filter((r) => r.type === "ready").length >
+        readiesBefore,
+    description,
+    timeoutMs,
+  );
+}
+
 /** Wait for the next `error` event and assert its named cause. */
 export async function expectNamedError(
   client: ProtocolClient,