Add workflow commands to CLI (#424)

### TL;DR

Added workflow management commands to the MCP Agent CLI, including describe, suspend, resume, and cancel operations.

### What changed?

- Added four new workflow management commands:
    - `describe_workflow`: Shows detailed information about a workflow execution
    - `suspend_workflow`: Pauses a running workflow execution
    - `resume_workflow`: Resumes a previously suspended workflow
    - `cancel_workflow`: Permanently stops a workflow execution
- Implemented corresponding API client methods in `WorkflowAPIClient`:
    - `suspend_workflow`
    - `resume_workflow`
    - `cancel_workflow`
- Updated the CLI structure to expose these commands under `mcp-agent cloud workflows`
- Added an alias for `describe_workflow` as `status` for backward compatibility

### How to test?

Test the new workflow commands with a running workflow:

```
# Get workflow details
mcp-agent cloud workflows describe run_abc123
mcp-agent cloud workflows status run_abc123  # alias

# Suspend a workflow
mcp-agent cloud workflows suspend run_abc123

# Resume a workflow (with optional payload)
mcp-agent cloud workflows resume run_abc123
mcp-agent cloud workflows resume run_abc123 --payload '{"data": "value"}'

# Cancel a workflow (with optional reason)
mcp-agent cloud workflows cancel run_abc123
mcp-agent cloud workflows cancel run_abc123 --reason "User requested cancellation"
```

### Why make this change?

These commands provide essential workflow lifecycle management capabilities to users, allowing them to monitor and control workflow executions through the CLI. The ability to suspend, resume, and cancel workflows gives users more control over long-running operations and helps manage resources more efficiently.

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->

## Summary by CodeRabbit

- New Features
  - Introduced “workflows” CLI group with commands: describe (alias: status), resume, suspend, and cancel.
  - Describe supports text, JSON, and YAML output; all commands work with server ID or URL and include improved error messages.

- Refactor
  - Renamed CLI group from “workflow” to “workflows” and reorganized command registrations.
  - Consolidated internal utility imports (no behavior change).

- Chores
  - Updated module descriptions.
  - Removed legacy workflow status package/exports in favor of the new workflows commands.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: jtcorbett

src/mcp_agent/cli/cloud/commands/logger/tail/main.py

@@ -17,7 +17,7 @@
 
 from mcp_agent.cli.exceptions import CLIError
 from mcp_agent.cli.auth import load_credentials, UserCredentials
-from mcp_agent.cli.cloud.commands.servers.utils import setup_authenticated_client
+from mcp_agent.cli.cloud.commands.utils import setup_authenticated_client
 from mcp_agent.cli.core.api_client import UnauthenticatedError
 from mcp_agent.cli.core.utils import parse_app_identifier, resolve_server_url
 from mcp_agent.cli.utils.ux import print_error

src/mcp_agent/cli/cloud/commands/servers/delete/main.py

@@ -5,7 +5,7 @@
 from mcp_agent.cli.core.utils import run_async
 from mcp_agent.cli.exceptions import CLIError
 from mcp_agent.cli.mcp_app.api_client import MCPApp
-from ..utils import (
+from ...utils import (
     setup_authenticated_client,
     resolve_server,
     handle_server_api_errors,

src/mcp_agent/cli/cloud/commands/servers/describe/main.py

@@ -7,7 +7,7 @@
 
 from mcp_agent.cli.exceptions import CLIError
 from mcp_agent.cli.mcp_app.api_client import MCPApp, MCPAppConfiguration
-from ..utils import (
+from ...utils import (
     setup_authenticated_client,
     validate_output_format, 
     resolve_server,

src/mcp_agent/cli/cloud/commands/servers/list/main.py

@@ -8,7 +8,7 @@
 
 from mcp_agent.cli.core.utils import run_async
 from mcp_agent.cli.mcp_app.api_client import MCPApp, MCPAppConfiguration
-from ..utils import (
+from ...utils import (
     setup_authenticated_client,
     validate_output_format, 
     handle_server_api_errors,

src/mcp_agent/cli/cloud/commands/servers/utils.py renamed to src/mcp_agent/cli/cloud/commands/utils.py

@@ -1,4 +1,4 @@
-"""Shared utilities for server commands."""
+"""Shared utilities for cloud commands."""
 
 from functools import wraps
 from typing import Union

src/mcp_agent/cli/cloud/commands/workflow/__init__.py

@@ -0,0 +1,12 @@
+"""MCP Agent Cloud workflows commands."""
+
+from .describe import describe_workflow
+from .resume import resume_workflow, suspend_workflow
+from .cancel import cancel_workflow
+
+__all__ = [
+    "describe_workflow",
+    "resume_workflow",
+    "suspend_workflow",
+    "cancel_workflow",
+]

src/mcp_agent/cli/cloud/commands/workflow/status/__init__.py

@@ -0,0 +1,5 @@
+"""MCP Agent Cloud workflow cancel command."""
+
+from .main import cancel_workflow
+
+__all__ = ["cancel_workflow"]