[task] Consolidate MCP files into pkg/cli/mcp subpackage

[github-actions]

Objective

Reorganize the 17 MCP-related files in pkg/cli into a dedicated pkg/cli/mcp/ subpackage to improve code organization and maintainability.

Context

The CLI package currently has 17 MCP-related files (all prefixed with mcp_*), which represents a significant portion of the package. This scattered organization makes the MCP functionality harder to navigate and maintain. Part of issue #4321.

Approach

1. Create new pkg/cli/mcp/ directory structure with logical subdirectories:
   • pkg/cli/mcp/registry/ for registry-related files
   • pkg/cli/mcp/workflow/ for workflow loading/scanning
2. Move and rename files (remove mcp_ prefix since they'll be in mcp package):
   • mcp_add.go → mcp/add.go
   • mcp_config_file.go → mcp/config.go
   • mcp_inspect.go + mcp_inspect_mcp.go → mcp/inspect.go (consolidate)
   • mcp_list.go → mcp/list.go
   • mcp_list_tools.go → mcp/list_tools.go
   • mcp_logs_guardrail.go → mcp/logs_guardrail.go
   • mcp_registry.go + mcp_registry_list.go + mcp_registry_types.go → mcp/registry/ package
   • mcp_schema.go → mcp/schema.go
   • mcp_secrets.go → mcp/secrets.go
   • mcp_server.go → mcp/server.go
   • mcp_tool_table.go → mcp/tool_table.go
   • mcp_validation.go → mcp/validation.go
   • mcp_workflow_loader.go + mcp_workflow_scanner.go → mcp/workflow/ package
3. Update all imports across the codebase to reference new package locations
4. Run tests to ensure no functionality is broken

Files to Create/Modify

Create:

• pkg/cli/mcp/ directory and subdirectories
• New package files in pkg/cli/mcp/, pkg/cli/mcp/registry/, pkg/cli/mcp/workflow/

Modify:

• All files that import the moved MCP CLI functions (update import paths)
• Move 17 MCP files from pkg/cli/ to appropriate locations in pkg/cli/mcp/

Delete:

• Original pkg/cli/mcp_*.go files after successful move

Acceptance Criteria

• All 17 MCP files successfully moved to pkg/cli/mcp/ subpackage structure
• Registry-related files organized in pkg/cli/mcp/registry/ subpackage
• Workflow-related files organized in pkg/cli/mcp/workflow/ subpackage
• All imports updated across codebase
• All existing tests pass: make test-unit
• No compilation errors: make build
• CLI commands continue to work correctly (manual testing of gh aw mcp commands)
• Top-level pkg/cli/ directory reduced from 74 to ~60 files

Estimated Effort

8-10 hours

Priority

High Impact, Medium Effort (Priority 1)
Related to #4321

AI generated by Plan Command for #4321