fix(test): assert the shape of release notes, not a phrase from one release

[AVANT-ICONIC]

The v9.0.1 release dry run failed on a perfectly valid changelog.

tests/unit/prepare-release.test.ts ended with:

expect(release.notes).toContain("Node.js runtime baseline");

That is a sentence from the 9.0.0 section, pinned into a test that reads
whatever version package.json currently names. It could only pass while 9.0.0
was current, so the first version bump after it was written was guaranteed to
turn the release workflow red — with release notes that were entirely correct.

A literal like that is a countdown, not a contract.

What it checks now

What the test means is "this version has real release notes". So:

expect(release.notes.length).toBeGreaterThan(100);
expect(release.notes).toMatch(/^[-*] /m);          // at least one bullet
expect(changelogText).toContain(`## [${packageVersion}]`);

Substantial prose, real changelog structure, and a section belonging to this
version rather than the previous one picked up because a marker was missing.

The real contract is untouched

Both genuine failure modes are still refused, by name:

empty section   -> refused: CHANGELOG.md section for 9.0.1 is empty
missing section -> refused: CHANGELOG.md does not contain '## [9.0.1]'

8/8 in this file. This unblocks the v9.0.1 release.

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• tests/unit/prepare-release.test.ts

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