(workflow) add simple harness workflow for manual testing

action/integration_test.go

@@ -1,3 +1,44 @@
 package action
 
-// Empty stub - will be filled in later
+import (
+	"context"
+	"fmt"
+	"os/exec"
+)
+
+// RunIntegrationTestInput is input to RunIntegrationTestActivity.
+type RunIntegrationTestInput struct {
+	WorktreePath string
+	TestCmd      string
+}
+
+// RunIntegrationTestOutput is the output of RunIntegrationTestActivity.
+type RunIntegrationTestOutput struct {
+	Passed bool
+	Logs   string
+}
+
+// RunIntegrationTestActivity runs integration tests in the worktree.
+func RunIntegrationTestActivity(ctx context.Context, in RunIntegrationTestInput) (RunIntegrationTestOutput, error) {
+	if in.TestCmd == "" {
+		// No test command, assume pass
+		return RunIntegrationTestOutput{Passed: true, Logs: "No test command provided"}, nil
+	}
+
+	// Run test command
+	cmd := exec.CommandContext(ctx, "sh", "-c", in.TestCmd)
+	cmd.Dir = in.WorktreePath
+
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		return RunIntegrationTestOutput{
+			Passed: false,
+			Logs:   string(output) + "\nError: " + err.Error(),
+		}, nil
+	}
+
+	return RunIntegrationTestOutput{
+		Passed: true,
+		Logs:   string(output),
+	}, nil
+}