fix(workflows): correct label date for changelog entries

[mbevc1]

Updated instructions for labeling changelog entries to reflect the release date instead of the workflow run date.

[claude]

Claude finished @mbevc1's task in 49s —— View job

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PR Review: Fix changelog label date instructions

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Summary: Good fix — the previous instruction told the workflow agent to use the workflow run date, but changelog entries should reflect the actual release date. The intent is correct and the change is small.

Findings (.mintlify/workflows/update-changelog.md):

Category	Finding
Suggestion	Line 26: Adding a comma after "release" (the date of the release, not when…) improves readability. See inline comment.
Improvement	Line 49: The trailing newline was removed (file now ends without \n). POSIX convention and most linters expect a final newline — consider restoring it. See inline comment.

No critical issues found. Both suggestions are offered as inline comments with ready-to-apply code suggestions.