Add regression test for WaitAny join schedule-before-cancel ordering

[Copilot]

The WaitAny join in counter-based flowcharts had a latent ordering bug: canceling remaining inbound branches before scheduling the outbound activity meant CompleteIfNoPendingWorkAsync could fire while the outbound activity was not yet in the scheduler, causing the flowchart to complete prematurely without ever executing the downstream activity.

Changes

• New regression test in FlowchartCounterBasedTests — WaitAnyJoin_SchedulesOutboundBeforeCancelingBlockedBranch

  • Forks into a fast WriteLine branch and a BlockingActivity (inner class that calls context.CreateBookmark(), simulating Delay/Timer suspension)
  • Both branches converge at FlowJoin(WaitAny) → WriteLine("AfterJoin")
  • The LIFO stack scheduler guarantees the blocking branch runs and suspends before the fast branch, reproducing the exact live-bookmark scenario

• Inner BlockingActivity — minimal sealed Activity subclass that suspends by creating a bookmark; no external dependency on Elsa.Workflows.Runtime required

Assertions

Assertion	What it proves
"AfterJoin" in output	Outbound path of the join actually executed
WorkflowStatus.Finished	No premature completion while outbound was unscheduled
WorkflowState.Bookmarks empty	Canceled branch's bookmark was cleared on cancellation

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[greptile-apps]

Greptile Summary

Added a comprehensive regression test for the WaitAny join ordering bug (issue #7335) that was fixed in commit 82c69d0. The test creates a flowchart with one fast branch and one blocking branch (using a new BlockingActivity inner class) converging at a FlowJoin(WaitAny). The test validates that the outbound activity executes, the workflow completes properly, and bookmarks are cleared - ensuring the fix prevents premature workflow completion when the outbound activity wasn't yet scheduled.

Confidence Score: 5/5

• This PR is safe to merge with no risk
• Test-only change that adds a well-crafted regression test with clear documentation, appropriate assertions, and follows existing patterns in the test suite
• No files require special attention

Important Files Changed

Filename	Overview
test/integration/Elsa.Activities.IntegrationTests/Flow/FlowchartCounterBasedTests.cs	Added well-documented regression test validating WaitAny join ordering fix with blocking branch scenario

_{Last reviewed commit: 5167c65}