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[temp][do not merge] probe: #889 Windows status protocol (O1/O2 of the #885 closeout plan) - #890
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… process is a lost controller On Windows the name a rename installs can be refused to a reader for a short interval. The waiter read that refusal as an unreadable controller record and declared a running compiler lost: 10 of 40 Windows-host cross builds failed this way (#890). Records and statuses are now opened with a bounded backoff (kRecordSettle, 250 ms) while the name exists; an absent name is absent at once and a refusal that outlasts the bound is an error. The controller's state is three-valued: only an identity that names an ended process is ended; an unreadable record is unknown and the waiter keeps waiting within its existing bounds. A loss is reported with the observation that decided it. copy_atomic publishes through the host namespace like every other record of the module, so a name in Windows' long spelling stays valid. A cancelled managed supervisor writes its status, and a registration failure reaches the supervisor log. Co-authored-by: speak-agent <248744407+speak-agent@users.noreply.github.com>
… candidate (D1 acceptance) Co-authored-by: speak-agent <248744407+speak-agent@users.noreply.github.com>
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Temporary probe for the open questions O1/O2 of
.agents/docs/2026-11-07-ecosystem-885-closeout-design.md(tracks #885, measures #889). Do not merge.614227f1unchanged; only the windows-host x86_64-linux-musl cross build of mcpp runs, repeated 20 times on one built binary.Every other workflow is removed on this branch. Output goes to the step summary and the uploaded artifacts.