Rename "docker_image_version" field to "version"

[Copilot]

Renames the docker_image_version field to version for GitHub and Playwright tool configurations, as this field applies to both libraries and containers, not just Docker images.

Problem

The current docker_image_version field name is misleading since it's used for both Docker containers and other library versions. A more generic version field name better represents its purpose.

Changes

This PR replaces the docker_image_version field with the new version field. The legacy field is no longer supported:

New syntax:

tools:
  github:
    version: "v2.0.0"
    allowed: [create_issue]
  playwright:
    version: "v1.41.0"
    allowed_domains: ["example.com"]

Legacy syntax (no longer supported):

tools:
  github:
    docker_image_version: "v1.5.0"  # ❌ Will cause validation error
    allowed: [create_issue]
  playwright:
    docker_image_version: "v1.40.0"  # ❌ Will cause validation error
    allowed_domains: ["example.com"]

Implementation Details

• Core functions: Updated getGitHubDockerImageVersion() and getPlaywrightDockerImageVersion() to only check version field
• MCP parser: Updated to only handle version field in configuration parsing
• Schema validation: Updated JSON schema to only recognize version field
• Documentation: All examples now use the new version field

Testing

• Updated unit tests to only test the version field functionality
• All existing tests continue to pass (384+ tests)
• Manual CLI testing confirms version field works correctly with schema validation
• Verified that docker_image_version field now properly fails validation

The change provides a cleaner, more semantically appropriate field name without backward compatibility complexity.

Original prompt

rename "docker-image-version" field to "version" as it applies both to libraries and containers

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[pelikhan]

@copilot remove support for docker_image_version

[Copilot]

@copilot remove support for docker_image_version

Removed backward compatibility support for docker_image_version. The system now only accepts the version field. Updated code, schema, and tests accordingly. Commit: e7a3ff2