Module feedback 

核心反馈类型：提供 FeedbackSink trait 和多种反馈事件（始终编译）。

Core feedback types (always compiled).

Provides FeedbackSink trait, FeedbackEvent enum, and NoopFeedbackSink for use by the client and other core modules. The full telemetry module (InMemoryFeedbackSink, ConsoleFeedbackSink, etc.) is feature-gated.

Structs

ChoiceSelectionFeedback

Feedback for multi-candidate selection.

CorrectionFeedback

Correction feedback.

NoopFeedbackSink

No-op sink (always available).

RatingFeedback

Rating feedback (e.g., 1-5 stars).

RegenerateFeedback

Regeneration feedback.

StopFeedback

Stop generation feedback.

TextFeedback

Free-form text feedback.

ThumbsFeedback

Thumbs up/down feedback.

Enums

FeedbackEvent

Typed feedback events (extensible).

Traits

FeedbackSink

Feedback sink trait.

Functions

noop_sink

Returns a no-op feedback sink.