feat: rewrite controlplane integration tests with pytest

[Hweinstock]

Issue #, if available: #316

Description of changes:

Problem

test_controlplane.py mixed unit and integration tests. Had a bug filtering memories by UUID prefix (never matched). Used pytest.mark.depends and pytest.mark.parallel adding complexity.

Solution

• Rewrite as integration-only TestMemoryControlPlaneClient class with 6 ordered tests.
• Fixed list filter to use name prefix.
• Added conftest.py with poll_until helper.
• Added pytest-order to dev deps.
• Add to CI to run in parallel to avoid sequential slow down.

Testing

passed in dev account, ~6 min runtime.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (main@2afa155). Learn more about missing BASE report.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #323   +/-   ##
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  Coverage        ?   90.83%           
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  Files           ?       42           
  Lines           ?     4036           
  Branches        ?      620           
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  Hits            ?     3666           
  Misses          ?      203           
  Partials        ?      167           

Flag	Coverage Δ
unittests	90.83% <ø> (?)

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