refactor: mv durabletask-python into sdk

[sicoyle]

Description

Move durabletask python into python sdk
https://github.com/dapr/durabletask-python

1. Moved durabletask/ into ext/dapr-ext-workflow/dapr/ext/workflow/_durabletask/ — vendored as a private internal package, no more separate PyPI dependency
2. Rewrote all imports across ext-workflow source, tests, and examples from durabletask.* to dapr.ext.workflow._durabletask.*; removed the try/except import fallbacks
3. Updated CI — deleted durabletask-validation.yml, removed standalone publish/test steps from build workflows; durabletask now tested and linted alongside everything else
4. Updated license headers on all vendored files from Microsoft/MIT to Dapr/Apache 2.0 (2026)
5. Cleaned up build config — removed durabletask-dapr from setup.cfg, dev-requirements.txt, and tox.ini; added pytest for durabletask unit tests; narrowed ruff exclude to only proto files

Issue reference

We strive to have all PR being opened based on an issue, where the problem or feature have been discussed prior to implementation.

Please reference the issue this PR will close: #[issue number]

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles correctly
• Created/updated tests
• Extended the documentation

[Copilot]

Pull request overview

Moves the durabletask-python SDK into this repository as a first-class package, adding its source, tests, examples, and CI/publishing hooks so it can be built and validated alongside the rest of the Python SDK workspace.

Changes:

• Added the new durabletask/ package (client, task primitives, deterministic helpers, gRPC helpers, async client support, packaging metadata).
• Added durabletask_tests/ and durabletask_examples/ to validate core behavior and sidecar-based E2E flows.
• Updated GitHub workflows and publish pipelines to run DurableTask validation and publish artifacts.

Reviewed changes

Copilot reviewed 44 out of 47 changed files in this pull request and generated 18 comments.

Show a summary per file

File	Description
durabletask_tests/durabletask/test_worker_stop.py	Adds unit tests around worker stop/cleanup behavior.
durabletask_tests/durabletask/test_worker_concurrency_loop_async.py	Adds async concurrency manager loop tests.
durabletask_tests/durabletask/test_worker_concurrency_loop.py	Adds sync + threaded concurrency manager loop tests.
durabletask_tests/durabletask/test_task.py	Adds unit tests for when_all / when_any primitives.
durabletask_tests/durabletask/test_serialization.py	Adds tests for JSON (de)serialization behavior.
durabletask_tests/durabletask/test_registry.py	Adds tests for worker registry validation and version selection.
durabletask_tests/durabletask/test_orchestration_wait.py	Adds tests for client wait timeout semantics.
durabletask_tests/durabletask/test_orchestration_e2e_async.py	Adds async E2E coverage against a sidecar.
durabletask_tests/durabletask/test_orchestration_e2e.py	Adds sync E2E coverage against a sidecar.
durabletask_tests/durabletask/test_deterministic.py	Adds determinism helper tests (random/uuid/time sequencing).
durabletask_tests/durabletask/test_concurrency_options.py	Adds tests for concurrency options defaults/overrides.
durabletask_tests/durabletask/test_client_async.py	Adds tests for async client channel/interceptor behavior.
durabletask_tests/durabletask/test_client.py	Adds tests for sync client channel/interceptor behavior.
durabletask_tests/durabletask/test_activity_executor.py	Adds tests for activity executor input/error handling.
durabletask_tests/init.py	Declares test package marker.
durabletask_examples/human_interaction.py	Adds human-interaction example (external event + timeout).
durabletask_examples/fanout_fanin.py	Adds fan-out/fan-in example.
durabletask_examples/activity_sequence.py	Adds sequence/chaining example.
durabletask_examples/README.md	Adds mechanical-markdown driven example validation doc.
durabletask/task.py	Introduces task model primitives and retry policy types.
durabletask/pyproject.toml	Adds standalone packaging metadata for durabletask distribution.
durabletask/internal/shared.py	Adds channel creation helpers, logging helper, JSON codec.
durabletask/internal/orchestrator_service_pb2_grpc.py	Adds generated gRPC service bindings.
durabletask/internal/helpers.py	Adds protobuf helper constructors and misc helpers.
durabletask/internal/grpc_interceptor.py	Adds sync gRPC metadata interceptor.
durabletask/internal/PROTO_SOURCE_COMMIT_HASH	Records source commit for generated protos.
durabletask/deterministic.py	Adds deterministic helpers/mixin (uuid/random/time sequencing).
durabletask/client.py	Adds sync client implementation.
durabletask/aio/internal/shared.py	Adds async channel creation helper.
durabletask/aio/internal/grpc_interceptor.py	Adds async gRPC metadata interceptor.
durabletask/aio/internal/init.py	Declares async internal package.
durabletask/aio/client.py	Adds async client implementation.
durabletask/aio/init.py	Exposes async client public API.
durabletask/init.py	Declares durabletask package root.
durabletask/README.md	Adds durabletask package README and usage docs.
durabletask/Makefile	Adds durabletask-local dev/test/proto-generation targets.
durabletask/LICENSE	Adds durabletask package license file.
durabletask/CHANGELOG.md	Adds durabletask package changelog.
.gitignore	Updates ignore patterns (tox/nox/IDEs/db artifacts).
.github/workflows/durabletask-validation.yml	Adds DurableTask-specific CI workflow (lint/tests/e2e/examples/publish).
.github/workflows/build.yaml	Adds DurableTask e2e/tests/examples execution to main build workflow.
.github/workflows/build-tag.yaml	Adds DurableTask publish step for tag builds.
.github/workflows/build-push-to-main.yaml	Adds DurableTask publish step for push-to-main workflow.

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[codecov]

Codecov Report

❌ Patch coverage is 67.97840% with 1660 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.34%. Comparing base (bffb749) to head (f4096b1).
⚠️ Report is 97 commits behind head on main.

Files with missing lines	Patch %	Lines
...rkflow/tests/durabletask/test_orchestration_e2e.py	5.93%	444 Missing ⚠️
...-workflow/dapr/ext/workflow/_durabletask/worker.py	61.96%	418 Missing ⚠️
.../tests/durabletask/test_orchestration_e2e_async.py	7.05%	303 Missing ⚠️
...abletask/internal/orchestrator_service_pb2_grpc.py	52.66%	71 Missing ⚠️
.../_durabletask/internal/orchestrator_service_pb2.py	15.38%	66 Missing ⚠️
...kflow/dapr/ext/workflow/_durabletask/aio/client.py	37.62%	63 Missing ⚠️
...-workflow/dapr/ext/workflow/_durabletask/client.py	61.00%	62 Missing ⚠️
...rkflow/_durabletask/internal/history_events_pb2.py	20.68%	46 Missing ⚠️
...xt-workflow/dapr/ext/workflow/_durabletask/task.py	88.29%	33 Missing ⚠️
...w/tests/durabletask/test_orchestration_executor.py	96.45%	33 Missing ⚠️
... and 11 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #963      +/-   ##
==========================================
- Coverage   86.63%   80.34%   -6.29%     
==========================================
  Files          84      136      +52     
  Lines        4473    12568    +8095     
==========================================
+ Hits         3875    10098    +6223     
- Misses        598     2470    +1872     

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[sicoyle]

btw pls ignore the codecov failures as I am copy/pasting durabletask in with changes to make build happy. I do not want to bridge the test caps of durabletask in this PR to limit scope.

[acroca]

I think we need to change all license headers to use dapr's license right?

[acroca]

Do we need the check?

Suggested change

	if not logger.handlers:
	logger.addHandler(log_handler)
	logger.addHandler(log_handler)

[sicoyle]

yes, this was a copilot feedback fix as well as I noticed double logging here and there personally that this addresses

[sicoyle]

@acroca I went ahead and better integrated durable task. See the updated PR description :)