[AI] expose isThought and thoughtSignature to public

[milaGGL]

Added static factory methods create for Part implementations to expose thoughtSignature and isThought properties.

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[github-actions]

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[milaGGL]

/gemini review

[gemini-code-assist]

Code Review

This pull request exposes the thoughtSignature and isThought properties on various Part implementations by changing thoughtSignature visibility to public and adding static factory create methods to their companion objects. It also fixes a bug in toPublic() where the URI and MIME type arguments for FileDataPart were swapped, and adds corresponding unit tests. The reviewer feedback suggests declaring thoughtSignature directly in the Part interface with a default implementation to allow polymorphic access, and recommends adding unit tests for the remaining Part implementations that received new create factory methods.

[milaGGL]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces static factory methods (create) for various Part implementations to expose and configure the isThought and thoughtSignature properties. It also makes thoughtSignature a public property on the Part interface and its implementations, fixes a parameter ordering bug in FileDataPart instantiation inside toPublic(), and adds corresponding unit tests. There are no review comments to address.