Add multi-worker handoff example combining Flows with the worker framework

Adds examples/multi_worker_handoff.py demonstrating how Pipecat Flows
composes with Pipecat's multi-worker framework. A free-form LLMWorker
router hands off to and from a structured Flows reservation worker over
the bus, sharing a single conversation context. The reservation worker is
built as a plain PipelineWorker with a FlowManager wired onto it and the
flow (re)initialized from its on_activated event handler.

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Author: aconchillo

changelog/279.added.md

@@ -0,0 +1 @@
+- Added `multi_worker_handoff.py` example showing how to compose Pipecat Flows with Pipecat's multi-worker framework. A structured Flows reservation worker (built as a plain `PipelineWorker` with a `FlowManager` wired onto it) hands off to and from a free-form `LLMWorker` router over the bus, sharing a single conversation context.

examples/README.md

@@ -26,6 +26,7 @@ See [quickstart/README.md](./quickstart/README.md) for a beginner-friendly intro
 #### Advanced Features
 
 - `warm_transfer.py` - Transferring calls between different flows (DailyTransport only)
+- `multi_worker_handoff.py` - Composing Flows with Pipecat's multi-worker framework: a structured Flows reservation worker hands off to and from a free-form `LLMWorker` router over the bus, sharing a single conversation context
 
 **Note:** All examples support multiple LLM providers (OpenAI, Anthropic, Google, AWS Bedrock) and transport options unless otherwise specified. Pipecat Flows handles the different function calling formats internally while maintaining a consistent API for developers.