refactor(llm): simplify live request telemetry (round 2)

docs/cordis-catalog/events.md

@@ -166,15 +166,15 @@ Source: [`packages/core/agent/src/types.ts:286`](../../packages/core/agent/src/t
 
 ### `agent/model-request` — emit
 
-One model request constructed its final stream handle and is about to iterate it. This live notification is not durable or replayed; failed or aborted iteration still has a dispatch, while preparation and synchronous stream-construction failures do not. Listener failures are contained and cannot affect the request.
+One model request obtained its outer `llm/stream` handle and is about to iterate it. This observes an Agent-loop request attempt, not proof that provider I/O began. The notification is live, contained, and not replayed. Preparation or a synchronous outer waterfall failure emits nothing; failures or abortion after the handle returns still count.
 
 ```ts cordis-catalog
 /**
- * One model request constructed its final stream handle and is about to
- * iterate it. This live notification is not durable or replayed; failed or
- * aborted iteration still has a dispatch, while preparation and
- * synchronous stream-construction failures do not. Listener failures are
- * contained and cannot affect the request.
+ * One model request obtained its outer `llm/stream` handle and is about to
+ * iterate it. This observes an Agent-loop request attempt, not proof that
+ * provider I/O began. The notification is live, contained, and not replayed.
+ * Preparation or a synchronous outer waterfall failure emits nothing;
+ * failures or abortion after the handle returns still count.
  * @param agent - the agent dispatching the model request.
  * @param turn - the open turn number.
  * @param step - the request's step number.

docs/cordis-catalog/services.md

@@ -780,16 +780,14 @@ async prepareCall(config: LlmCallConfig, signal?: AbortSignal): Promise<Prepared
  * agent-loop request recovery; middleware and nested-call failures remain
  * untagged for the outer call.
  * @param options - the full request; `options.provider` selects the adapter.
- * @param onDispatched - contained Agent-loop notification hook invoked after
- *   a stream handle is constructed and before its adapter is iterated.
  * @returns the chunk stream, possibly wrapped by `llm/stream` listeners.
  */
-stream(options: GenerateOptions, onDispatched?: () => void): AsyncIterable<StreamChunk>
+stream(options: GenerateOptions): AsyncIterable<StreamChunk>
 ```
 
 Types: [GenerateOptions](../core-data-structures/core.md) · [LlmAdapter](../core-data-structures/llm-streaming.md) · [LlmCallConfig](../core-data-structures/core.md) · [LlmModelInfo](../core-data-structures/core.md) · [LlmProviderInfo](../core-data-structures/core.md) · [LlmResolvedModelInfo](../core-data-structures/core.md) · [PreparedLlmCall](../core-data-structures/llm-streaming.md) · [ResolvedRetryPolicy](../core-data-structures/llm-streaming.md) · [StreamChunk](../core-data-structures/llm-streaming.md)
 
-Source: [`packages/llm/llm/src/index.ts:194`](../../packages/llm/llm/src/index.ts)
+Source: [`packages/llm/llm/src/index.ts:192`](../../packages/llm/llm/src/index.ts)
 
 ## `ctx.permission` — `PermissionService`