docs(spec): design for excluding a value from a search, item 86

Two decisions the user made, both recorded with their rejected
alternatives so they are not revisited.

Excluding from an empty query would mean the whole Maildir minus one
value. The menu entry is greyed rather than hidden when the query bar is
empty, so the feature stays visible to someone exploring a fresh window,
and SearchTerm::exclude returns empty for that case as a second layer
against a caller that forgets the guard.

The menus cannot see the query bar, so MainWindow pushes the fact down
through MessageView::setHasQuery from the textChanged lambda it already
runs for the Save button. A callback was rejected as an indirection with
one implementation; silently doing nothing was rejected because a live
menu entry that does nothing is worse than a greyed one.

The backlog entry loses its inline approach and points at the spec,
carrying the three constraints that decide whether it can be picked up.

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

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