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test(changelog): stop selecting release headings by the letter "v"

`documents every release when nothing sets a floor` filtered headings with
`h.includes('v')`, meaning to pick out `## v1.0.0` and its siblings. The
unreleased heading carries the fixture's temp directory name, and that name's
random suffix contains a lowercase `v` about 9% of the time - so the filter
counted 4 instead of 3 and the spec failed with nothing in it pointing at why.

Caught on a real release run, where the suffix was `uqmZvQ`. Across the three
Node versions in the matrix that is a ~25% chance of a red run, which is what
made it look like a timing flake and earned it the "just re-run it" treatment.

Selecting by the absence of `Unreleased` says what the assertion means - every
*released* segment - and cannot be perturbed by a directory name. Verified
against the exact headings from the failing run: the old filter returns 4, the
new one returns 3.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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