Implements environment selection per MULTI_LANGUAGE_ENVIRONMENT_SPECIFICATION.md. The planning phase now selects an appropriate Docker image (Python, Miniforge, Node.js, Java, Go) based on project requirements, and the execution environment is started with that image.

Dockerfiles

• Added docker/executor-{python,miniforge,node,java,go}/Dockerfile
• All images include git, curl, wget, jq, tree pre-installed
• Build via docker compose --profile executor-build build

Config

• config.yaml: Added environments mapping and default_environment setting
• docker-compose.yml: Added executor services under executor-build profile

ExecutionEnvironmentManager

• get_available_environments() / get_default_environment() for environment discovery
• prepare(task, environment_name) accepts optional environment selection
• _create_container() returns (container_id, is_custom_image) tuple to skip git install on pre-built images
• ContainerInfo includes environment_name attribute

PlanningCoordinator

• _build_environment_selection_prompt() injects environment options into planning prompt
• _extract_selected_environment() parses LLM's environment choice from plan response
• State persistence includes selected_environment for pause/resume

Example LLM Response Format

{
  "goal_understanding": {...},
  "action_plan": {...},
  "selected_environment": {
    "name": "node",
    "reasoning": "package.json detected, TypeScript project"
  }
}

System Prompt

• Updated system_prompt_command_executor.txt with environment table and package manager guides per environment

• Fixes 計画時に必要な言語環境を用意したイメージを選択して実行環境を起動する仕組み実装 #111

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