fix issue 313 by adding the missing completion signature

[dietmarkuehl]

No description provided.

[Copilot]

🟢 Approval recommended

The change is small, targeted to the reported issue, and includes a focused regression test covering the fix.

Pull request overview

Fixes issue 313 by correcting the reported completion signatures for counting_scope_join so they include set_stopped, and adds a regression test to ensure co_await scope.join() compiles/works as expected.

Changes:

• Extend counting_scope_join_t::get_completion_signatures() to include set_stopped_t().
• Add a new regression test (issue-313.test.cpp) and register it in the execution tests CMake list.
• Silence an unused-result warning in an existing stop-token test via (void)std::exchange(...).

File summaries

File	Description
tests/beman/execution/thread-stoptoken-intro.test.cpp	Explicitly discards std::exchange return value to avoid unused-result diagnostics.
tests/beman/execution/issue-313.test.cpp	New regression test exercising co_await scope.join() (issue 313).
tests/beman/execution/CMakeLists.txt	Registers the new issue-313 test target.
include/beman/execution/detail/counting_scope_join.hpp	Adds missing set_stopped_t() to counting_scope_join completion signatures.

Review details

• Files reviewed: 4/4 changed files
• Comments generated: 0
• Review effort level: Lite

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[coveralls]

coverage: 93.403% (-0.05%) from 93.454% — fix-issue-313 into main