feat: thread step --count/-c <number> to run multiple steps

Add --count/-c flag to 'uwf thread step' for running N steps in one
invocation, stopping early if $END is reached.

- cmdThreadStep now loops up to count times, delegates to cmdThreadStepOnce
- CLI parses -c/--count, defaults to 1 (backward compatible single output)
- Validation rejects 0, negative, and non-integer counts
- 7 new tests covering CLI parsing and count validation

Fixes #373

Co-authored-by: uwf-hermes (solve-issue workflow)

packages/cli-workflow/src/__tests__/thread-step-count.test.ts

@@ -0,0 +1,71 @@
+import { execFileSync } from "node:child_process";
+import { join } from "node:path";
+import { describe, expect, test } from "vitest";
+
+const CLI_PATH = join(import.meta.dirname, "..", "cli.js");
+
+function runCli(args: string[]): { stdout: string; stderr: string; exitCode: number } {
+  try {
+    const stdout = execFileSync("bun", ["run", CLI_PATH, ...args], {
+      encoding: "utf8",
+      env: { ...process.env, WORKFLOW_STORAGE_ROOT: "/tmp/uwf-test-nonexistent" },
+      stdio: ["ignore", "pipe", "pipe"],
+    });
+    return { stdout, stderr: "", exitCode: 0 };
+  } catch (e: unknown) {
+    const err = e as NodeJS.ErrnoException & { stdout?: string; stderr?: string; status?: number };
+    return {
+      stdout: err.stdout ?? "",
+      stderr: err.stderr ?? "",
+      exitCode: err.status ?? 1,
+    };
+  }
+}
+
+describe("thread step --count CLI parsing", () => {
+  test("--help shows -c/--count option", () => {
+    const result = runCli(["thread", "step", "--help"]);
+    expect(result.stdout).toContain("--count");
+    expect(result.stdout).toContain("-c");
+  });
+
+  test("description says 'one or more steps'", () => {
+    const result = runCli(["thread", "step", "--help"]);
+    expect(result.stdout).toContain("one or more steps");
+  });
+});
+
+describe("cmdThreadStep count logic", () => {
+  test("count=0 fails with validation error", () => {
+    const result = runCli(["thread", "step", "FAKE_THREAD_ID", "-c", "0"]);
+    expect(result.exitCode).not.toBe(0);
+    expect(result.stderr).toContain("positive integer");
+  });
+
+  test("negative count fails with validation error", () => {
+    const result = runCli(["thread", "step", "FAKE_THREAD_ID", "-c", "-1"]);
+    expect(result.exitCode).not.toBe(0);
+    expect(result.stderr).toContain("positive integer");
+  });
+
+  test("non-integer count fails with validation error", () => {
+    const result = runCli(["thread", "step", "FAKE_THREAD_ID", "-c", "1.5"]);
+    expect(result.exitCode).not.toBe(0);
+    expect(result.stderr).toContain("positive integer");
+  });
+
+  test("count=1 is the default (no -c flag)", () => {
+    // Without -c, it should attempt to run 1 step (failing on missing thread, not on count validation)
+    const result = runCli(["thread", "step", "FAKE_THREAD_ID"]);
+    expect(result.exitCode).not.toBe(0);
+    // Should NOT contain "positive integer" error — should fail on thread lookup instead
+    expect(result.stderr).not.toContain("positive integer");
+  });
+
+  test("count=3 passes validation (fails on thread lookup)", () => {
+    const result = runCli(["thread", "step", "FAKE_THREAD_ID", "-c", "3"]);
+    expect(result.exitCode).not.toBe(0);
+    // Should NOT contain "positive integer" error — should fail on thread/storage lookup
+    expect(result.stderr).not.toContain("positive integer");
+  });
+});

packages/cli-workflow/src/cli.ts

@@ -108,15 +108,21 @@ thread
 
 thread
   .command("step")
-  .description("Execute one step")
+  .description("Execute one or more steps")
   .argument("<thread-id>", "Thread ULID")
   .option("--agent <cmd>", "Override agent command")
-  .action((threadId: string, opts: { agent: string | undefined }) => {
+  .option("-c, --count <number>", "Number of steps to run (default: 1)")
+  .action((threadId: string, opts: { agent: string | undefined; count: string | undefined }) => {
     const storageRoot = resolveStorageRoot();
     runAction(async () => {
       const agentOverride = opts.agent ?? null;
-      const result = await cmdThreadStep(storageRoot, threadId, agentOverride);
-      writeOutput(result);
+      const count = opts.count !== undefined ? Number(opts.count) : 1;
+      const results = await cmdThreadStep(storageRoot, threadId, agentOverride, count);
+      if (results.length === 1) {
+        writeOutput(results[0]);
+      } else {
+        writeOutput(results);
+      }
     });
   });
 

packages/cli-workflow/src/commands/thread.ts

@@ -673,6 +673,27 @@ export async function cmdThreadStep(
   storageRoot: string,
   threadId: ThreadId,
   agentOverride: string | null,
+  count: number,
+): Promise<StepOutput[]> {
+  if (count < 1 || !Number.isInteger(count)) {
+    fail(`--count must be a positive integer, got: ${count}`);
+  }
+
+  const results: StepOutput[] = [];
+  for (let i = 0; i < count; i++) {
+    const result = await cmdThreadStepOnce(storageRoot, threadId, agentOverride);
+    results.push(result);
+    if (result.done) {
+      break;
+    }
+  }
+  return results;
+}
+
+async function cmdThreadStepOnce(
+  storageRoot: string,
+  threadId: ThreadId,
+  agentOverride: string | null,
 ): Promise<StepOutput> {
   const index = await loadThreadsIndex(storageRoot);
   const headHash = index[threadId];