Add optional default field to free response

[amishler]

• Enables pre-filling a free response question with a given text, which the user can edit or submit as is.
• The initial question state is AnsweredFreeResponse if the default is present, in case the user submits without editing.

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Note

Low Risk
Adds an optional default_value to free-response question payloads and initializes UI state from it; changes are localized and backwards-compatible, with low risk aside from potential type/serialization mismatches for consumers.

Overview
Enables free-response user questions to include an optional pre-filled answer via a new FreeResponseQuestion.default_value field.

Updates the Rust wire types and regenerated TS bindings so free_response questions carry this optional data, and adjusts the Autopilot UI question-card state to pre-populate and mark steps as AnsweredFreeResponse when a default is provided.

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