Fix ask-user test snapshots

[qmuntal]

Some ask-user test snapshots no longer match what GitHub Copilot CLI v0.0.400 outputs.

Fixes #315.

[Copilot]

Pull request overview

This PR updates the ask-user test snapshots so they match the current GitHub Copilot CLI v0.0.400 behavior for freeform ask_user responses, unblocking timeouts in multiple SDK test suites.

Changes:

• Align freeform tool message content from "User response (freeform): ..." to "User responded: ..." across all ask-user snapshot variants.
• Add allow_freeform: true to the ask_user tool arguments in the askuser snapshot so all variants model the freeform flow consistently.
• Normalize the final assistant message in the ask-user freeform snapshot to match the updated conversation wording.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
test/snapshots/askuser/should_handle_freeform_user_input_response.yaml	Updates the tool content to "User responded: ..." and adds allow_freeform: true to match the freeform CLI behavior.
test/snapshots/ask_user/handle_freeform_user_input_response.yaml	Updates the tool content string to the new "User responded: ..." format for consistency.
test/snapshots/ask-user/should_handle_freeform_user_input_response.yaml	Updates the tool content and the assistant’s final message text to align this snapshot with the current CLI output and other snapshots.

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