Guard empty swarm task extraction

[yedidyakfir]

Summary

Prevent swarm filling from reaching Rapyer task extraction when there are no task IDs to load.

Changes

• add an explicit early-return guard immediately before the variadic Rapyer lookup
• add a focused unit test that fails if an empty swarm invokes rapyer.afind or dispatches tasks
• document the fix in the unreleased 0.3.6 changelog

Testing

• uv run --project libs/mageflow pytest -q libs/mageflow/tests/unit (258 passed)
• uv run --project libs/mageflow ruff check libs/mageflow/mageflow/swarm/workflows.py libs/mageflow/tests/unit/workflows/test_fill_running_tasks.py
• uv run --project libs/mageflow black --check libs/mageflow/mageflow/swarm/workflows.py libs/mageflow/tests/unit/workflows/test_fill_running_tasks.py
• git diff --check develop...HEAD

Closes #132

Summary by CodeRabbit

• Bug Fixes
  • Improved swarm task processing when no task IDs are available.
  • Prevented unnecessary database lookups and workflow execution attempts in this case.
  • Updated the changelog to document the fix.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 1141be98-d0c1-49b4-a555-51f9f12583bd

📥 Commits

Reviewing files that changed from the base of the PR and between d6b94c3 and 3a8aca0.

📒 Files selected for processing (3)

• CHANGELOG.md
• libs/mageflow/mageflow/swarm/workflows.py
• libs/mageflow/tests/unit/workflows/test_fill_running_tasks.py

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📝 Walkthrough

Walkthrough

fill_running_tasks now returns early when no task IDs are available, preventing an empty Rapyer lookup. A focused async test verifies extraction and dispatch are skipped, and CHANGELOG.md documents the fix.

Changes

Swarm task guard

Layer / File(s)	Summary
Guard empty task extraction libs/mageflow/mageflow/swarm/workflows.py, libs/mageflow/tests/unit/workflows/test_fill_running_tasks.py, CHANGELOG.md	fill_running_tasks returns [] before querying Rapyer when no IDs exist. The test confirms extraction and signature dispatch are not called, and the changelog records the behavior.

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

🚥 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 matches the main change: guarding empty swarm task extraction.
Linked Issues check	✅ Passed	The guard, focused test, and changelog update satisfy issue #132's requirements.
Out of Scope Changes check	✅ Passed	No unrelated code changes are apparent beyond the requested guard, test, and changelog.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ 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 codex/132-guard-empty-swarm-extraction

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