docs: record item 15 and summarise the manual pass

Eleven of twenty-two items verified. Items 16-18 remain deferred until the
tag-mutation path can be run with someone watching, 19-20 need a sync
script, and 13 is unreachable with this mailbox and covered by a unit test
instead.

Records what the pass was worth: three defects, each living in the gap
between components that were individually tested and correct.

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

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