[andrewheard]

Generated BidiGenerateContent (Gemini Live API) data models and updated GenerateContent data models from Google Discovery Document revision 20261103. This is PR 2 of a 6-PR stack migrating FirebaseAILogic onto the generated wire types and is based on # (GenerateContent+ file renames).

Data models (GeminiAPIDataModels)

• Generated BidiGenerateContentClientMessage and BidiGenerateContentServerMessage along with their transitive Live API types under GeminiLanguageModel/Sources/GeminiAPIDataModels/BidiGenerateContent, including a manual override for BidiGenerateContentSetup.toolConfig (which is accepted by the Live API despite being omitted from the Discovery Document) and VoiceActivity.ActivityType (avoiding collision with the Swift .Type metatype keyword).
• Configured oneOf overrides for BidiGenerateContentClientMessage and BidiGenerateContentServerMessage to emit nested Data enums while preserving usageMetadata on the server message.
• Updated GenerateContent models from Discovery Document revision 20261103 (AudioTranscriptionConfig.sourceText, FunctionResponsePart.mediaProcessing, ToolType.mediaProcessing, UsageMetadata.responseTokenCount and responseTokensDetails, and PaLM HarmCategory deprecations).
• Added a shared TimeSpan type (google.protobuf.Duration) and mapped format: google-duration properties to TimeSpan.
• Named new generated files with the GenerateContent+ prefix for consistency with #; the generator itself adopts the prefix in the follow-up namespacing PR.

Code generator (typegen)

• Partitioned generated output into GenerateContent and BidiGenerateContent subdirectories via DEFAULT_ROOT_GROUPS while keeping shared schemas in GenerateContent.
• Added cross-backend oneOf unioning, colliding renamed-schema merging (preserving backend provenance within the same backend), nested enum propertyTypeOverrides, and format: google-duration -> TimeSpan primitive mapping.
• Required STRING when extracting the standalone DataType enum.
• Guarded generated @available(*, deprecated) attributes with #if hasAttribute(diagnose) so older toolchains without @diagnose(DeprecatedDeclaration, as: ignored) (such as CocoaPods validation builds) compile deprecated enum cases without unsuppressible warnings.

Testing

• Added TimeSpanTests and typegen unit tests covering deprecation guards, google-duration mapping, oneOf unioning, and BidiGenerateContent schema merging.

#no-changelog

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