[task] Fix critical schema-parser mismatch: cache-memory docker-image field not implemented

[github-actions]

Objective

Resolve the critical mismatch where cache-memory.docker-image is defined in the JSON schema but completely missing from the Go parser implementation, making this advertised feature non-functional.

Context

The schema consistency check (discussion #3589) discovered that users can configure a custom Docker image for the cache-memory MCP server in their workflow YAML, but this configuration is silently ignored because the parser doesn't implement it.

Current State:

• Schema advertises the feature at pkg/parser/schemas/main_workflow_schema.json:2041
• Parser struct in pkg/workflow/cache.go:19-24 omits the DockerImage field entirely
• Users' configurations pass validation but don't work

Approach

Option A: Implement the feature (recommended if docker-image customization is needed)

1. Add DockerImage string \yaml:"docker-image,omitempty"`to theCacheMemoryEntrystruct inpkg/workflow/cache.go`
2. Update the extractCacheMemoryConfig function to handle the docker-image configuration
3. Modify cache-memory MCP server generation code to use the custom image when specified
4. Add validation to ensure the docker-image value is a valid image reference

Option B: Remove from schema (if feature is not intended)

1. Remove the docker-image property from the cache-memory schema definition
2. Document why this feature is not supported

Files to Modify

If implementing:

• pkg/workflow/cache.go - Add DockerImage field to CacheMemoryEntry struct
• pkg/workflow/cache.go - Update extractCacheMemoryConfig function
• pkg/workflow/mcp_servers.go - Update MCP server generation to use custom image
• pkg/workflow/cache_test.go - Add test coverage for docker-image configuration

If removing:

• pkg/parser/schemas/main_workflow_schema.json - Remove docker-image property from cache-memory definition

Acceptance Criteria

• Decision made: implement feature OR remove from schema
• If implementing: DockerImage field added to struct with proper yaml tag
• If implementing: Custom docker images are used when configured
• If implementing: Tests verify docker-image configuration works correctly
• If removing: Schema no longer advertises unsupported feature
• Schema validation and parser implementation are aligned

Related Documentation

• Discussion [Schema Consistency] 🔍 Schema Consistency Check - 2025-11-11: Network & MCP Integration Analysis #3589 - Schema Consistency Check findings
• pkg/parser/schemas/main_workflow_schema.json:2041 - Schema definition
• pkg/workflow/cache.go:19-24 - Current parser implementation
  Related to [Schema Consistency] 🔍 Schema Consistency Check - 2025-11-11: Network & MCP Integration Analysis #3589

AI generated by Plan Command for discussion #3589

[pelikhan]

@copilot remove from schema.