verify render: NONE line may read as clean when select's unknown_because is set #113

Severity: Low · Status: needs verification (one verifier observed it; the code calls sel.none_is_unknown, so it may be a rendering-order issue rather than a missing signal)

Where: testgraph/verify.py:277-281

Claim: with no journeys selected and several warnings, verify printed journeys selected: NONE — nothing to verify as its headline. The UNKNOWN reasons only appear as indented lines below it. select and hook instead put "UNKNOWN, not verified-safe" in the headline itself (issue #75's rule).

Suggested fix: use the same two-sentence headline as select._render when unknown_because is non-empty.