Prober: no packaging or release-name-plus-extension as inner name

Lone candidates are often par2 volumes of random-named sets
("42507096….vol007+08.par2"): their yEnc name was taken as the inner
name. Packaging names are skipped for lone files too, and a name that
starts with the release's own name says nothing new.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/unit/probe/inspect.spec.ts

@@ -123,5 +123,8 @@ test.group('probe / innerName', () => {
     assert.equal(innerName([lone], 'k3j4h5'), 'Real.Name.mkv')
     // A random-named file whose yEnc name is its random name says nothing new.
     assert.isNull(innerName([lone], 'real.name.mkv'))
+    assert.isNull(innerName([lone], 'Real.Name'))
+    // Nor does packaging: a lone par2 volume.
+    assert.isNull(innerName([{ kind: 'lone', result: { yencName: 'a1b2.vol007+08.par2', size: 1, type: 'par2' } }], 'x9y8'))
   })
 })