Add pyright type-checking to examples, fix discoveries

[andystaples]

As stated. Also fixes a bug where random.choices returned an array when the result was expecting a boolean

[Copilot]

Pull request overview

This PR expands pyright strict type-checking coverage to the examples/ folder and updates multiple sample scripts to satisfy strict typing (plus fixes a small correctness issue in one sample).

Changes:

• Add examples/ to pyrightconfig.json include list so samples are type-checked in strict mode.
• Add/adjust type annotations across multiple example orchestrators/activities for pyright strict compatibility.
• Fix a sample bug where random.choices(...) returned list[bool] instead of bool.

Reviewed changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
pyrightconfig.json	Adds examples/ to pyright strict checking scope.
examples/work_item_filtering.py	Adds orchestrator generator return typing.
examples/version_aware_orchestrator.py	Adds orchestrator typing; removes incorrect int result annotation.
examples/sub-orchestrations-with-fan-out-fan-in/worker.py	Adds activity/orchestrator typing; fixes random.choices boolean bug; improves task typing.
examples/sandboxes/main_app.py	Adds typing imports and SandboxWorkerProfileOptions annotation.
examples/large_payload/app.py	Adds orchestrator generator typing (but main() still missing -> None).
examples/in_memory_backend_example/src/workflows.py	Adds typing for activities/orchestrators and collection types.
examples/human_interaction.py	Replaces namedtuple usage with a typed NamedTuple; adds orchestrator typing.
examples/history_export/app.py	Adds orchestrator generator typing.
examples/fanout_fanin.py	Adds activity/orchestrator typing and task list typing.
examples/entities/function_based_entity.py	Makes entity input optional/nullable; adds orchestrator generator typing.
examples/entities/function_based_entity_actions.py	Makes entity input optional/nullable; adds orchestrator typing.
examples/entities/entity_locking.py	Makes entity add input nullable; adds orchestrator generator typing.
examples/entities/class_based_entity.py	Makes entity add input nullable; adds orchestrator generator typing.
examples/entities/class_based_entity_actions.py	Makes entity add input nullable; adds orchestrator typing.
examples/distributed-tracing/app.py	Adds typing for lists/results and orchestrator generator typing.
examples/activity_sequence.py	Adds orchestrator generator typing.