docs(backlog): correct item 164, the first cause was wrong

The entry blamed a missing drafts helper. Neither half of that was true.

NOT_ARRIVALS in qtmaildirconf.py is ("sent", "drafts"), so sent_folders()
already returns both; the function name says sent and its contents do not,
which is what made the wrong reading plausible. Run against the real
config it returns every account's drafts folder, and notmuch count over
the carve-out query and the affected message id returns 1: the query the
hook builds MATCHES the draft. The folder list and the query are correct
and the fix is not there.

A second theory is also recorded as dead. An mbsync-style rename does not
re-apply new.tags: measured in a throwaway database, a file renamed to add
,U=4 and reindexed kept the tags it had.

What is established: the carve-out is scoped to tag:new, the draft carries
inbox, and tag:new is 0, so it was never in scope when the hook ran. The
installed hooks are symlinks into this repository, verified rather than
assumed, so the code read is the code that runs.

What is not established is which pass tagged the file. The likely shape is
an ordering one, since item 158 indexes a draft from the application
itself and a file already known to the database is not new on the next
pass, but that is a third hypothesis and the first two were both wrong.
The entry now calls for a reproducer driving the real sequence before any
code is written, since the hook tags real mail unattended every ten
minutes.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UUQS6n3cmsFrsjCNmwNtf8

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