Stabilize workflow fixture assertions

[rmcdaniel]

Summary

• replace assertion-driven workflow fixture checks with explicit AssertionError guards so test behavior does not depend on PHP assert settings
• keep the runningInConsole() preconditions explicit in test fixtures instead of letting them disappear when assertions are disabled
• update WorkflowTest::testCompletedDelay() to expect the deterministic TestWorkflow side-effect log entry

Testing

• composer feature -- --filter AsyncWorkflowTest
• vendor/bin/phpunit --testdox --testsuite feature --filter '^Tests\\Feature\\WorkflowTest(::.*)?$'
• composer unit -- --filter WorkflowStubTest

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (68e47cd) to head (537389f).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##              master      #362   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       579       579           
===========================================
  Files             62        62           
  Lines           2007      2007           
===========================================
  Hits            2007      2007           

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