Fix: Register CHANGELOG.md as a commit pattern in the release hook

[tajobe]

Summary

• axion-release's built-in commit hook only stages files explicitly registered via HookContext.addCommitPattern() — it does not commit all working-tree changes, only what's registered.
• Our changelog-patching hook wrote CHANGELOG.md to disk but never registered it as a commit pattern, so the release commit ended up empty and the patched changelog was discarded.
• This is exactly what caused the real v0.3.0 release to go out broken: the tag was created against an empty "Release version: 0.3.0" commit with CHANGELOG.md still showing [Unreleased], which made the downstream git-release action fail (it couldn't find a "0.3.0" section) — no GitHub release or package was published for that tag.
• Fix: call context.addCommitPattern("CHANGELOG.md") alongside the existing patchChangelogToVersion(context.releaseVersion) call in the pre-release hook.

Test plan

• Reproduced and confirmed the root cause by inspecting the real failed run's logs and the actual (empty) release commit on main
• Verified the fix end-to-end using axion's release.localOnly mode in an isolated git worktree off main (with the fix applied and a throwaway commit ahead of the last tag, so axion would compute a real next version): the resulting local release commit now includes the full CHANGELOG.md diff — new version header, moved unreleased entries, regenerated compare links — instead of being empty
• ./gradlew clean build passes

[Copilot]

Pull request overview

This PR fixes the axion-release pre-release changelog patching hook so the updated CHANGELOG.md is actually staged and included in the release commit (axion only commits files explicitly registered via HookContext.addCommitPattern(...)).

Changes:

• Update the axion scmVersion { hooks { pre { ... } } } hook to register CHANGELOG.md via context.addCommitPattern("CHANGELOG.md").
• Document the release-commit staging fix in CHANGELOG.md.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
build.gradle.kts	Registers CHANGELOG.md as a commit pattern in the axion pre-release hook so the patched changelog is included in the release commit.
CHANGELOG.md	Notes the fix in the Unreleased “Fixed” section for release workflow transparency.

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