Add rake changelog task (git-cliff)

[klobuczek]

Adds the changelog rake task, matching neo4j-ruby-driver, to complete the git-cliff release procedure (which already has cliff.toml and the tag-triggered release.yml).

rake changelog                      # refresh the [Unreleased] section from merged PRs
rake "changelog[v12.0.0.beta.7]"    # finalize a version section at release

Wraps git cliff -o CHANGELOG.md. When a tag is given it's validated against \Av\d[\w.-]*\z and passed to sh as an array (no shell interpolation, so the tag can't inject commands).

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features
  • Added a changelog task to generate or refresh the project changelog.
  • Supports optional version tags with validation before generation.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: a88d58ca-9be2-4f2b-b516-93e7c00ac375

📥 Commits

Reviewing files that changed from the base of the PR and between 4f48397 and 305ac90.

📒 Files selected for processing (1)

• Rakefile

Included review availability: Your plan includes up to 4 reviews per rolling hour; 3 remain after this review.

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📝 Walkthrough

Walkthrough

The Rakefile adds a changelog[tag] task. The task validates an optional version tag and invokes git cliff without shell interpolation to regenerate CHANGELOG.md.

Changes

Changelog generation

Layer / File(s)	Summary
Validated changelog task Rakefile	Adds the changelog[tag] task, documents its usage, validates optional version tags, and invokes git cliff to write CHANGELOG.md without a shell.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 305ac

This localized change adds a validated changelog task without introducing an actionable merge-blocking risk; it is merge-ready after normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the added Rake changelog task and its use of git-cliff.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch rake-changelog

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[Copilot]

Pull request overview

Adds a new changelog Rake task to support the project’s git-cliff-based release workflow by regenerating CHANGELOG.md, optionally finalizing a specified version section via a validated tag.

Changes:

• Introduces rake changelog to regenerate CHANGELOG.md using git-cliff.
• Adds optional tag argument handling with validation and safe argument passing to sh (no shell interpolation).

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