chore: implement phase 9 - #2787
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Invariant defended: H5/H7. The one question: can check report a pass over a window it did not prove? Check() is the I/O shell around the pure decide(). Single-step synthesizes the header and its own sentinel, so no mode flag reaches the pure layer. Log mode stops the recorder before the one full read. The header, not a definition re-resolved after the window closed, is the authority for what was paused when the window opened — it decides `skipped`, the drain set, and the transitionGrace max. The flock, not the pidfile, is the authority for whether a writer still exists.
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Invariant defended: H5/H7. The one question: can check report a pass
over a window it did not prove?
Check() is the I/O shell around the pure decide(). Single-step
synthesizes the header and its own sentinel, so no mode flag reaches
the pure layer. Log mode stops the recorder before the one full read.
The header, not a definition re-resolved after the window closed, is
the authority for what was paused when the window opened — it decides
skipped, the drain set, and the transitionGrace max. The flock, notthe pidfile, is the authority for whether a writer still exists.
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