Rename BaseTask → BaseWorker and reserve "task" for asyncio

Replaces every "task" identifier that referred to the BaseTask
abstraction with "worker". Asyncio task plumbing (asyncio.Task,
BaseTaskManager, TaskManager, create_task, cancel_task, etc.) stays
untouched. Highlights:

- Classes: BaseTask → BaseWorker, PipelineTask → PipelineWorker,
  LLMTask → LLMWorker, LLMContextTask → LLMContextWorker, TaskBus →
  WorkerBus, TaskRegistry → WorkerRegistry, TaskActivationArgs →
  WorkerActivationArgs, TaskReadyData → WorkerReadyData,
  TaskRegistryEntry → WorkerRegistryEntry, TaskObserver →
  WorkerObserver, all Bus*TaskMessage → Bus*WorkerMessage,
  BusAddTaskMessage.task field → worker, BusWorkerRegistryMessage.tasks
  field → workers.
- Methods/decorators: activate_task → activate_worker, deactivate_task
  → deactivate_worker, add_task → add_worker, watch_task →
  watch_worker, @task_ready → @worker_ready, setup_pipeline_task hook
  → setup_pipeline_worker.
- Params/fields: FrameProcessorSetup.pipeline_task and
  FunctionCallParams.pipeline_task → pipeline_worker. Parameter names
  like task_name → worker_name; spawn/run accept worker:.
- Files: pipeline/base_task.py → base_worker.py, pipeline/task.py →
  worker.py (plus a re-export shim at pipeline/task.py),
  task_observer.py → worker_observer.py, task_ready_decorator.py →
  worker_ready_decorator.py, pipecat.tasks → pipecat.workers,
  llm_task.py → llm_worker.py, llm_context_task.py →
  llm_context_worker.py, examples/multi-task → examples/multi-worker.

Back-compat:
- PipelineTask kept as a deprecated subclass of PipelineWorker that
  warns on construction.
- pipecat.pipeline.task re-exports PipelineWorker/PipelineTask/etc. so
  existing user imports keep working.
- FrameProcessor.pipeline_task kept as a deprecated property that
  forwards to pipeline_worker.

Local variables in examples that hold a worker (task = PipelineTask(...))
are renamed to worker = PipelineWorker(...). Asyncio-task locals
(runner_task, etc.) are preserved.

examples/video-processing/video-processing-custom-video-track.py

@@ -31,7 +31,7 @@ from pipecat.frames.frames import (
 )
 from pipecat.pipeline.pipeline import Pipeline
 from pipecat.pipeline.runner import PipelineRunner
-from pipecat.pipeline.task import PipelineTask
+from pipecat.pipeline.worker import PipelineWorker
 from pipecat.processors.frame_processor import FrameDirection, FrameProcessor
 from pipecat.runner.types import RunnerArguments
 from pipecat.runner.utils import create_transport
@@ -177,7 +177,7 @@ async def run_bot(transport: BaseTransport, runner_args: RunnerArguments):
     generator = VideoPatternGenerator(WIDTH, HEIGHT, FPS)
     blue_tint = BlueTintProcessor(destination="blue")
 
-    task = PipelineTask(
+    worker = PipelineWorker(
         Pipeline([generator, blue_tint, transport.output()]),
         idle_timeout_secs=runner_args.pipeline_idle_timeout_secs,
     )
@@ -189,10 +189,10 @@ async def run_bot(transport: BaseTransport, runner_args: RunnerArguments):
     @transport.event_handler("on_client_disconnected")
     async def on_client_disconnected(transport, client):
         logger.info("Client disconnected")
-        await task.queue_frame(EndFrame())
+        await worker.queue_frame(EndFrame())
 
     runner = PipelineRunner(handle_sigint=runner_args.handle_sigint)
-    await runner.run(task)
+    await runner.run(worker)
 
 
 async def bot(runner_args: RunnerArguments):

examples/video-processing/video-processing-gstreamer-filesrc.py

@@ -11,7 +11,7 @@ from loguru import logger
 
 from pipecat.pipeline.pipeline import Pipeline
 from pipecat.pipeline.runner import PipelineRunner
-from pipecat.pipeline.task import PipelineTask
+from pipecat.pipeline.worker import PipelineWorker
 from pipecat.processors.gstreamer.pipeline_source import GStreamerPipelineSource
 from pipecat.runner.types import RunnerArguments
 from pipecat.runner.utils import create_transport
@@ -58,7 +58,7 @@ async def run_bot(transport: BaseTransport, runner_args: RunnerArguments):
         ]
     )
 
-    task = PipelineTask(
+    worker = PipelineWorker(
         pipeline,
         idle_timeout_secs=runner_args.pipeline_idle_timeout_secs,
     )
@@ -70,11 +70,11 @@ async def run_bot(transport: BaseTransport, runner_args: RunnerArguments):
     @transport.event_handler("on_client_disconnected")
     async def on_client_disconnected(transport, client):
         logger.info(f"Client disconnected")
-        await task.cancel()
+        await worker.cancel()
 
     runner = PipelineRunner(handle_sigint=runner_args.handle_sigint)
 
-    await runner.run(task)
+    await runner.run(worker)
 
 
 async def bot(runner_args: RunnerArguments):

examples/video-processing/video-processing-gstreamer-videotestsrc.py

@@ -10,7 +10,7 @@ from loguru import logger
 
 from pipecat.pipeline.pipeline import Pipeline
 from pipecat.pipeline.runner import PipelineRunner
-from pipecat.pipeline.task import PipelineTask
+from pipecat.pipeline.worker import PipelineWorker
 from pipecat.processors.gstreamer.pipeline_source import GStreamerPipelineSource
 from pipecat.runner.types import RunnerArguments
 from pipecat.runner.utils import create_transport
@@ -54,14 +54,14 @@ async def run_bot(transport: BaseTransport, runner_args: RunnerArguments):
         ]
     )
 
-    task = PipelineTask(
+    worker = PipelineWorker(
         pipeline,
         idle_timeout_secs=runner_args.pipeline_idle_timeout_secs,
     )
 
     runner = PipelineRunner(handle_sigint=runner_args.handle_sigint)
 
-    await runner.run(task)
+    await runner.run(worker)
 
 
 async def bot(runner_args: RunnerArguments):

examples/video-processing/video-processing-local-mirror.py

@@ -19,7 +19,7 @@ from pipecat.frames.frames import (
 )
 from pipecat.pipeline.pipeline import Pipeline
 from pipecat.pipeline.runner import PipelineRunner
-from pipecat.pipeline.task import PipelineParams, PipelineTask
+from pipecat.pipeline.worker import PipelineParams, PipelineWorker
 from pipecat.processors.frame_processor import FrameDirection, FrameProcessor
 from pipecat.runner.types import RunnerArguments
 from pipecat.runner.utils import create_transport, maybe_capture_participant_camera
@@ -93,14 +93,14 @@ async def run_bot(transport: BaseTransport, runner_args: RunnerArguments):
 
     pipeline = Pipeline([transport.input(), MirrorProcessor(), tk_transport.output()])
 
-    task = PipelineTask(
+    worker = PipelineWorker(
         pipeline,
         params=PipelineParams(),
         idle_timeout_secs=runner_args.pipeline_idle_timeout_secs,
     )
 
     async def run_tk():
-        while not task.has_finished():
+        while not worker.has_finished():
             tk_root.update()
             tk_root.update_idletasks()
             await asyncio.sleep(0.1)
@@ -113,11 +113,11 @@ async def run_bot(transport: BaseTransport, runner_args: RunnerArguments):
     @transport.event_handler("on_client_disconnected")
     async def on_client_disconnected(transport, client):
         logger.info(f"Client disconnected")
-        await task.cancel()
+        await worker.cancel()
 
     runner = PipelineRunner(handle_sigint=runner_args.handle_sigint)
 
-    await asyncio.gather(runner.run(task), run_tk())
+    await asyncio.gather(runner.run(worker), run_tk())
 
 
 async def bot(runner_args: RunnerArguments):

examples/video-processing/video-processing-mirror.py

@@ -17,7 +17,7 @@ from pipecat.frames.frames import (
 )
 from pipecat.pipeline.pipeline import Pipeline
 from pipecat.pipeline.runner import PipelineRunner
-from pipecat.pipeline.task import PipelineParams, PipelineTask
+from pipecat.pipeline.worker import PipelineParams, PipelineWorker
 from pipecat.processors.frame_processor import FrameDirection, FrameProcessor
 from pipecat.runner.types import RunnerArguments
 from pipecat.runner.utils import create_transport
@@ -76,7 +76,7 @@ async def run_bot(transport: BaseTransport, runner_args: RunnerArguments):
 
     pipeline = Pipeline([transport.input(), MirrorProcessor(), transport.output()])
 
-    task = PipelineTask(
+    worker = PipelineWorker(
         pipeline,
         params=PipelineParams(),
         idle_timeout_secs=runner_args.pipeline_idle_timeout_secs,
@@ -89,11 +89,11 @@ async def run_bot(transport: BaseTransport, runner_args: RunnerArguments):
     @transport.event_handler("on_client_disconnected")
     async def on_client_disconnected(transport, client):
         logger.info(f"Client disconnected")
-        await task.cancel()
+        await worker.cancel()
 
     runner = PipelineRunner(handle_sigint=runner_args.handle_sigint)
 
-    await runner.run(task)
+    await runner.run(worker)
 
 
 async def bot(runner_args: RunnerArguments):

examples/video-processing/video-processing.py

@@ -14,7 +14,7 @@ from pipecat.audio.vad.silero import SileroVADAnalyzer
 from pipecat.frames.frames import Frame, InputImageRawFrame, LLMRunFrame, OutputImageRawFrame
 from pipecat.pipeline.pipeline import Pipeline
 from pipecat.pipeline.runner import PipelineRunner
-from pipecat.pipeline.task import PipelineParams, PipelineTask
+from pipecat.pipeline.worker import PipelineParams, PipelineWorker
 from pipecat.processors.aggregators.llm_context import LLMContext
 from pipecat.processors.aggregators.llm_response_universal import (
     LLMContextAggregatorPair,
@@ -122,7 +122,7 @@ async def run_bot(pipecat_transport):
         ]
     )
 
-    task = PipelineTask(
+    worker = PipelineWorker(
         pipeline,
         params=PipelineParams(
             enable_metrics=True,
@@ -130,7 +130,7 @@ async def run_bot(pipecat_transport):
         ),
     )
 
-    @task.rtvi.event_handler("on_client_ready")
+    @worker.rtvi.event_handler("on_client_ready")
     async def on_client_ready(rtvi):
         logger.info("Pipecat client ready.")
         # Kick off the conversation.
@@ -140,7 +140,7 @@ async def run_bot(pipecat_transport):
                 "content": "Start by greeting the user warmly and introducing yourself.",
             }
         )
-        await task.queue_frames([LLMRunFrame()])
+        await worker.queue_frames([LLMRunFrame()])
 
     @pipecat_transport.event_handler("on_client_connected")
     async def on_client_connected(transport, participant):
@@ -153,11 +153,11 @@ async def run_bot(pipecat_transport):
     @pipecat_transport.event_handler("on_client_disconnected")
     async def on_client_disconnected(transport, client):
         logger.info("Pipecat Client disconnected")
-        await task.cancel()
+        await worker.cancel()
 
     runner = PipelineRunner(handle_sigint=False, force_gc=True)
 
-    await runner.run(task)
+    await runner.run(worker)
 
 
 async def bot(runner_args: RunnerArguments):