Add `changenotes.mts assemble` command to move changenotes to CHANGELOG.md - #4155

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mario-campos/merge-changenotes

Commits on Sep 18, 2026

Do not include trailing newlines in `NO_CHANGES_STR`
mario-campos
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cb31eab
Add changelog parsing helper `getHeader`
mario-campos
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47d607e
Add CHANGELOG function `addBodyLinesToUnreleasedSection`
mario-campos
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bb1dc54
Add `changenotes.mts flush` command
mario-campos
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1ee3265
Use `withChangelog` I/O helper
mario-campos
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bffae1c
Use `ExitCode` instead of `0`/`1`
mario-campos
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b246e56
Assume '[UNRELEASED]' section is first section
mario-campos
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d63b2a4
Simplify `getHeader` to operate on `ChangelogSection`s
mario-campos
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128614a
Simplify `addBodyLinesToUnreleasedSection`
mario-campos
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bc0efd6
Replace `splice` with `push` and `pop`
mario-campos
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977b29b
Rename `flush` command to `assemble`
mario-campos
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7f54212
Refactor changenote file listing into function to D.R.Y.
mario-campos
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a92f7fb