feat(flux)!: support flux-general-multi and mid-session reconfiguration (0.10.0)

[GregHolmes]

Summary

• Adds Model::FluxGeneralMulti, OptionsBuilder::language_hint, and the languages / languages_hinted fields on FluxResponse::TurnInfo so callers can use Deepgram's multilingual Flux model from the Rust SDK.
• Adds FluxHandle::configure(ConfigureRequest) for mid-session reconfiguration of thresholds, keyterms, and language hints; server replies surface as FluxResponse::ConfigureSuccess / ConfigureFailure. Both ConfigureRequest and FluxResponse::TurnInfo are now #[non_exhaustive] so future fields stay backwards-compatible.
• Two new examples: examples/transcription/flux/multi_language.rs and examples/transcription/flux/dynamic_configure.rs.
• Adds examples/audio/bueller-mono.wav (mono Linear16 downmix of the existing bueller.wav) so the Flux examples have enough audio + trailing silence to actually trigger EndOfTurn against the live server. Flux is mono-only at the API.
• Bumps version to 0.10.0.

⚠️ Breaking change

FluxResponse::TurnInfo gained two new fields (languages, languages_hinted) and is now #[non_exhaustive]. Callers that destructured TurnInfo with a literal struct pattern need to add .. or name the new fields. In pre-1.0 Cargo semver, this requires a 0.9.x → 0.10.0 bump.

Note on the big branch: feat/agent-websocket (the Phase 1–10 spec-coverage branch) was also targeting 0.10.0. Once this PR ships, the big branch will rebase and target 0.11.0 instead.

Test plan

• cargo test --all-features — 61 unit + 3 integration + 136 doctests passing (1 integration test ignored, gated on a live API key)
• cargo clippy --all-features --all-targets -- -D warnings clean
• cargo fmt --check clean
• cargo build --example flux_multi_language --example flux_dynamic_configure --features listen builds clean
• flux_multi_language runs end-to-end live: StartOfTurn arrives with languages_hinted=["en", "es"], EndOfTurn arrives with Detected languages: ["en"] — both new TurnInfo fields deserialize correctly off the wire
• flux_dynamic_configure runs end-to-end live: after first EndOfTurn, sends Configure { eot_threshold: 0.85, keyterms: ["weather", "forecast"] }, server returns ConfigureSuccess with the echoed values

[Copilot]

Pull request overview

Adds multilingual Flux model support and introduces mid-session WebSocket reconfiguration capabilities to the Rust SDK, enabling callers to bias language detection and update thresholds/keyterms/hints without restarting a session.

Changes:

• Added Model::FluxGeneralMulti plus OptionsBuilder::language_hint to send repeated language_hint=... query parameters.
• Extended FluxResponse with per-turn languages / languages_hinted and new ConfigureSuccess / ConfigureFailure responses (including ConfigureThresholds).
• Introduced FluxHandle::configure(ConfigureRequest) and added two new Flux examples demonstrating multilingual usage and dynamic configuration.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/listen/flux.rs	Adds ConfigureRequest, wire-message serialization, and FluxHandle::configure support in the WS worker.
src/common/options.rs	Adds FluxGeneralMulti model and language_hint option serialization as repeated query params.
src/common/flux_response.rs	Adds new Flux response variants/fields and threshold type with round-trip tests.
examples/transcription/flux/multi_language.rs	New example demonstrating multilingual Flux + language hints and printing detected languages.
examples/transcription/flux/dynamic_configure.rs	New example demonstrating sending Configure mid-session and handling acknowledgements.
Cargo.toml	Registers the two new examples behind the listen feature.

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