docs: include JSDoc in website API markers

website/zh-CN/api/harness/llm.md

@@ -11,6 +11,14 @@ The abstract `llm` service: an adapter registry plus a streaming model-call surf
 ### ctx.llm.registerAdapter(providers, adapter)
 
 ```ts website-api
+/**
+ * Register an adapter for the given provider routes. Throws `LlmError` with code
+ * `DUPLICATE_ADAPTER` if any provider already has an adapter (all-or-nothing).
+ * Disposed with the fiber.
+ * @param providers - every provider route this adapter should serve.
+ * @param adapter - the adapter that streams calls for those providers.
+ * @returns the disposer that unregisters all of them.
+ */
 registerAdapter(providers: string[], adapter: LlmAdapter): () => void
 ```
 
@@ -26,6 +34,10 @@ Register an adapter for the given provider routes. Throws `LlmError` with code `
 ### ctx.llm.listProviders()
 
 ```ts website-api
+/**
+ * Describe provider routes with a registered adapter.
+ * @returns detached provider metadata in registration order.
+ */
 listProviders(): LlmProviderInfo[]
 ```
 
@@ -38,6 +50,12 @@ Describe provider routes with a registered adapter.
 ### ctx.llm.listModels(provider)
 
 ```ts website-api
+/**
+ * Discover models advertised by one registered provider. Catalog membership
+ * is advisory and never changes routing or request validation.
+ * @param provider - registered provider route to inspect.
+ * @returns detached model metadata in adapter-preferred order.
+ */
 async listModels(provider: string): Promise<LlmModelInfo[]>
 ```
 
@@ -52,6 +70,15 @@ Discover models advertised by one registered provider. Catalog membership is adv
 ### ctx.llm.stream(options)
 
 ```ts website-api
+/**
+ * Stream one model call as raw chunks (token-level deltas). Throws
+ * `LlmError` with code `NO_ADAPTER` if no adapter is registered for
+ * `options.provider`. Replay state is retained only when the same adapter
+ * instance owns its historical provider and the target provider. Dispatches
+ * through the `llm/stream` waterfall.
+ * @param options - the full request; `options.provider` selects the adapter.
+ * @returns the chunk stream, possibly wrapped by `llm/stream` listeners.
+ */
 stream(options: GenerateOptions): AsyncIterable<StreamChunk>
 ```