baby steps towards a Structured Concurrency API #61

Job	Run time
Cxx interop / Construct Cxx interop matrix	2s
Unit tests / Construct unit test matrix	6s
Soundness / Documentation check	2m 53s
Soundness / API breakage check	4m 19s
Soundness / Unacceptable language check	2s
Soundness / Broken symlinks check	5s
Soundness / License headers check	4s
Soundness / Format check	38s
Soundness / Shell check	35s
Soundness / YAML lint check	5s
Soundness / Python lint check	5s
Cxx interop / Cxx interop / Linux (5.9)	2m 30s
Cxx interop / Cxx interop / Linux (5.10)	2m 16s
Cxx interop / Cxx interop / Linux (6.0)	2m 37s
Cxx interop / Cxx interop / Linux (nightly-6.1)	3m 12s
Cxx interop / Cxx interop / Linux (nightly-main)	3m 15s
Unit tests / Unit tests / Linux (5.9)	4m 35s
Unit tests / Unit tests / Linux (5.10)	4m 29s
Unit tests / Unit tests / Linux (6.0)	5m 2s
Unit tests / Unit tests / Linux (nightly-6.1)	3m 24s
Unit tests / Unit tests / Linux (nightly-main)	3m 25s
	43m 39s

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