Exception logs probe

[rmcdaniel]

Summary

This change replaces the global "any prior Workflow\\Exception log" suppression with a replay probe.

When an exception job arrives for a missing log index, we now:

• tentatively insert that exception log inside a transaction
• replay the workflow in a probing mode that does not dispatch missing work or execute side effects
• keep the exception only if replay actually matches that tentative exception on the active path

This preserves the child-exception propagation fix from #348 while avoiding the later logging regression reported in #372.

Root cause

1.0.70 changed exception persistence from "one log per index" to "only the first exception log anywhere in the workflow". That deduped stale parallel sibling failures, but it also suppressed legitimate later exceptions after:

• signal-driven retries
• consecutive caught failures at new indexes

Heuristics like "previous log is an exception" or "same replay timestamp" were still too coarse, because real workflows can catch one exception and then legitimately hit another failure without any neutral log in between.

What changed

• add a probing replay mode to WorkflowStub / Workflow
• prevent probing replays from dispatching missing activities, children, timers, side effects, or versions
• pass the failing child source class into Workflow\\Exception jobs
• only persist a tentative exception if the probing replay matches that exact (index, class) on the live path
• add regression coverage for:
  • signal-driven retries logging multiple sequential exceptions
  • back-to-back caught failures logging multiple sequential exceptions
  • parallel child failures still deduping to one parent exception log

Validation

Live sample-app repro with a real queue:work worker:

• php artisan app:pr374-review retry --timeout=30
• php artisan app:pr374-review back-to-back --timeout=30
• php artisan app:pr374-review child --timeout=30

Workflow repo tests:

• php vendor/bin/phpunit --testsuite unit --filter ExceptionTest
• php vendor/bin/phpunit --testsuite feature --filter ExceptionLoggingReplayTest

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 99.19%. Comparing base (0f4b774) to head (d8d4219).

Files with missing lines	Patch %	Lines
src/ChildWorkflowStub.php	77.77%	4 Missing ⚠️
src/Exception.php	94.64%	3 Missing ⚠️
src/Traits/Awaits.php	50.00%	2 Missing ⚠️
src/Traits/SideEffects.php	33.33%	2 Missing ⚠️
src/Traits/Timers.php	60.00%	2 Missing ⚠️
src/Traits/Versions.php	33.33%	2 Missing ⚠️
src/WorkflowStub.php	88.23%	2 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##              master     #375      +/-   ##
=============================================
- Coverage     100.00%   99.19%   -0.81%     
- Complexity       578      626      +48     
=============================================
  Files             62       62              
  Lines           2005     2118     +113     
=============================================
+ Hits            2005     2101      +96     
- Misses             0       17      +17     

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