Codex gate finding on #7385: the new fold-matching (#7228) normalizes the search
term by stripping [\s._-], so a separator-only query ('.', '-', '_') folds to '' and
String.includes('') is always true — every model matched. Verified: searching '.'
returned all models, including ids with no dot.
Guard the folded clauses with a non-empty foldTerm, keeping the literal
name/id includes() checks so '-' still matches ids that really contain one.
Real searches ('ox alpha' / 'ox-alpha' / 'sonnet') are unchanged.
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