docs: close item 84, spec item 36

Item 84's section moves to the closed file, recording that the fix was
a split rather than a suppression, and that its mutation check
reproduces the original hang at exit 124 rather than merely failing.

Item 36 is specced and no longer "on demand": item 66 needs it. Two
findings while writing it. The deliverable is a RED reproduction of 66,
with the fix deliberately excluded, since that defect has never been
isolated and designing a fix beside a hypothesis is how a wrong one gets
locked in. And the item is smaller than it has read since 2026-08-04:
wireWorker() already builds the worker from a config key, so a test
writes a config pointing at the fixture and nothing in src/ changes.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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