Changelog: Note cooperative future-cancel + bounded (exit) drain unde… #210

Job	Run time
reproducibility - hermetic build	1m 5s
safety - strict warnings	59s
canary - darwin (zig cc)	1m 15s
build - ubuntu-24.04-arm	4m 9s
build - windows-2022	1m 7s
canary - jit-host (macos-14)	3m 25s
canary - msvc (cl.exe)	2m 24s
reproducibility - stencils	39s
safety - sanitizers (UBSan+TSan)	2m 18s
build - macos-14	3m 17s
canary - jit-host (ubuntu-24.04-arm)	2m 0s
canary - jit-host (windows-2022)	7m 29s
build - ubuntu-24.04	4m 44s
reproducibility - byte-identical binary	1m 10s
canary - jit-host (ubuntu-24.04)	2m 11s
	38m 12s

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