Say what the artefact check measured, not what it implies

Two claims in E9 went further than the evidence, in an entry whose whole subject
is a figure that was quoted past its own.

"All 16 sat on that one line" was consistent with what was measured, not
established by it: `MediaProbe:321` accounts for a 16-branch difference and the
denominators now agree at 1338, but the other lines were never enumerated in both
reports, so a line that lost coverage elsewhere would have been invisible to the
check that was run. Says that now.

And `matroskaOrWebm` is not "the only string-literal `when` in that file" --
`shortName` at :429 is a second one. The parenthetical was never checked; it is
gone rather than repaired, since the mechanism was not what the measurement
established anyway.

The previous commit message carries the stronger wording. It is left alone rather
than rewritten, because that would need a force push.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

docs/e2e-read-findings.md

@@ -563,10 +563,15 @@ and is not.
 
 E8 warned that the union's branch denominator ran 16 ahead of the JVM's, "entirely inside
 `MediaProbe`", and told readers not to quote a MediaProbe branch figure raw. Rebuilt, both
-denominators are **1338** and `MediaProbe:321` (`matroskaOrWebm`, the only string-literal `when` in
-that file) reads `mb=0 cb=4` — fully covered. All 16 sat on that one line. So it was an artefact of
-how the report was constructed and never a property of the code, and E8's caveat is withdrawn rather
-than carried forward. `matroskaOrWebm` is not, and never was, a gap.
+denominators are **1338**, and `MediaProbe:321` (`matroskaOrWebm`) reads `mb=0 cb=4` — fully
+covered, against `mb=11` of 20 before.
+
+**Stated as measured, because this entry is about a number that was quoted past its evidence.** That
+one line accounts for a 16-branch difference, and the two denominators now agree. The remaining
+lines were *not* enumerated in both reports, so read that as consistent with the whole gap sitting
+at `:321` rather than as proof that nothing moved elsewhere. Either way the difference is an
+artefact of how the report was constructed and not a property of the code, so E8's caveat is
+withdrawn rather than carried forward: `matroskaOrWebm` is not, and never was, a gap.
 
 ### The result: 23 arms on 22 lines, and 12 of the 22 are decided here