[async worker] align engine tests with runtime behavior

[ayubun]

Description

Align the async engine recompile tests with the runtime behavior introduced by #454. The GC test now verifies the required collect-then-freeze sequence, and the cycle-break fixture now models the iterable, hashable Sources contract instead of using a plain list.

Related Issues/Tasks

• async image workspace parity: [async worker] include atproto workspace in image #461 — merge after this PR
• cancellation cleanup: [async worker] harden UDF cancellation and cleanup #459 — merge after this PR, after [async worker] include atproto workspace in image #461
• timeout enforcement: [async worker] add configurable native UDF timeouts #452 — merge after this PR, after [async worker] harden UDF cancellation and cleanup #459

Models used

• openai/gpt-5.6-sol: ~70%
• anthropic/claude-opus-4-8: ~20%
• anthropic/claude-haiku-4-5: ~10%

Testing

• RED: both targeted tests failed before the change with the observed gc.collect() expectation and missing Sources.hash() errors
• uv run pytest osprey_async_worker/src/osprey/async_worker/tests/test_engine.py -q (7 passed)
• uv run pytest osprey_async_worker/src/osprey/async_worker/tests -q (124 passed)
• uv run ruff check .
• uv run ruff format --diff osprey_async_worker/src/osprey/async_worker/tests/test_engine.py
• uv run mypy osprey_async_worker/src/osprey/async_worker/tests/test_engine.py
• uv tool run fawltydeps --check-unused --pyenv .venv

Checklist

• Tests pass locally
• uv run ruff check . passes (no unused imports or other lint errors)
• uv tool run fawltydeps --check-unused --pyenv .venv passes (no unused dependencies)
• Updated CHANGELOG.md with my changes, if notable (not applicable; test-only correction)

Summary by CodeRabbit

• Tests
  • Improved automated coverage for source updates and graph validation.
  • Added checks confirming reliable handling of source collections, iteration, hashing, and memory cleanup sequencing.
  • These tests help protect application stability during updates involving validated sources.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between ce4e696 and 616d4ed.

📒 Files selected for processing (1)

• osprey_async_worker/src/osprey/async_worker/tests/test_engine.py

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📝 Walkthrough

Walkthrough

The test suite now verifies gc.collect() before gc.freeze() during source updates. Graph fixtures use a Sources-compatible mock with iterable contents and a configured hash.

Changes

GC source update test coverage

Layer / File(s)	Summary
Source update GC validation osprey_async_worker/src/osprey/async_worker/tests/test_engine.py	The tests import call and Sources, configure validated.sources as an iterable Sources mock, and verify the gc.collect() then gc.freeze() call order.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 616d4

This PR updates async engine tests to match existing runtime behavior without changing production code; no actionable merge-blocking risk remains after normal checks and review.

Suggested reviewers: exbreder

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes aligning async worker engine tests with the runtime behavior changed in this pull request.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ayu/repair-async-engine-tests

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