feat!: (regen) diarization v2 batch GA, listen-provider dedup, think/models route fix

[GregHolmes]

Summary

Fern SDK regeneration for 2026-05-14.

Patches re-applied

• ClientOptions.java — restored SDK identity headers (User-Agent, X-Fern-SDK-Name, X-Fern-SDK-Version) to the com.deepgram:deepgram-java-sdk values and re-added // x-release-please-version markers. Generator still overwrites these.
• ReconnectingWebSocketListener.java — re-applied the three fixes from fix(reconnect): listener bug fixes + transport factory policy hook #45:
  1. maxRetries(0) semantics: retryCount > maxRetries (initial attempt always proceeds; cap applies to retries only).
  2. Configurable connectionTimeoutMs on ReconnectOptions (default 4000ms; was hardcoded).
  3. applyOptionsOverride(...) runtime hook used by TransportWebSocketFactory to apply per-transport reconnect policy without editing generated WS clients.

No patches were dropped — the generator has not caught up on any of the above. Both files remain in .fernignore at their original paths.

Notable generator changes (non-patch)

• Listen provider type refactor — moved AgentV1SettingsAgentContextListenProvider{V1,V2,V2LanguageHint} from resources/agent/v1/types/ → top-level types/DeepgramListenProvider* and deleted AgentV1SettingsAgentListenProvider{V1,V2} (~400 lines combined).
• New listen/media types: ListenV1RequestUrl, MediaTranscribeRequestOctetStream, MediaTranscribeRequestDiarizeModel; AsyncRawMediaClient/RawMediaClient updated.
• Small updates to Environment.java, RawModelsClient.java, .fern/metadata.json.

Test plan

• ./gradlew test compileExamples passes (includes regression tests for maxRetries(0), applyOptionsOverride, connectionTimeoutMs).
• Reviewer confirms listen-provider type rename does not break public API contract.