`ConfidentTier` and `Confident()` are a name for what was about to be
written as `== RecommendationStrong` at two call sites: the album page
telling the user unprompted that there is a match for what they are
looking at (#28), and strict auto-accept rewriting files without asking
(#90). A page that claims confidence the auto-accept pass would decline
is the app contradicting itself, and #90 asks for exactly this — that
the two agree on what "high confidence" means rather than computing it
twice.
What they do not share is written down beside it. Surfacing a match is
a suggestion with a confirm dialog behind it; auto-accept is an
irreversible on-disk rewrite gated on further conditions the tier
cannot express — exact track count, every title matching, lengths
within a couple of seconds, no cover replacement, no MBID conflict. So
this is the floor both stand on, not the whole of either test.
`Confident` is a rank comparison rather than an equality, so a tier
added above "strong" later does not silently stop qualifying.
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