feat(task): add images parameter for subagent image passthrough

[CSWNDQTJ-Kenny]

Add support for passing images to subagents via the task tool. This allows visual analysis tasks by providing image attachments that will be included in the subagent's prompt.

Changes:

• Add images parameter to BaseParameterFields in task.ts
• Modify runTask to convert and pass images to subagent prompt
• Update task.txt documentation with images parameter usage
• Add test case for images parameter passing

Issue for this PR

Closes #34409 #36020 #32302 #25553

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

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[github-actions]

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[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Potential Duplicate Found

PR #32302: fix(opencode): forward parent attachments to subagents

• fix(opencode): forward parent attachments to subagents #32302
• This PR is directly related—it addresses forwarding attachments to subagents, which is similar functionality to passing images. This PR is also explicitly listed in the "Closes" section of the current PR (feat(task): add images parameter for subagent image passthrough #39417).

The current PR (#39417) appears to be the only one specifically implementing the images parameter feature, but PR #32302 handles a related concern about forwarding parent attachments to subagents. These may be part of the same feature work or one may depend on the other.

[github-actions]

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