docs(changelog): add v0.2.1 entry for module-help.csv header rename

[bmadcode]

Summary

• Adds the v0.2.1 changelog entry that the release workflow needs to publish.
• Documents the after/before → preceded-by/followed-by rename from fix(catalog): rename module-help.csv after/before columns to preceded-by/followed-by #35.

Test plan

• Merge this PR.
• Re-trigger the Release workflow to bump v0.2.0 → v0.2.1, push the tag, and create the GitHub Release.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 01e2791a-2732-45fb-b3db-dcb213f3d4b7

📥 Commits

Reviewing files that changed from the base of the PR and between 0a3413a and 9bbdf6e.

📒 Files selected for processing (1)

• CHANGELOG.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch changelog-0.2.1

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[augmentcode]

🤖 Augment PR Summary

Summary: Adds the v0.2.1 changelog entry required for the release workflow.
Change: Documents the module-help.csv header rename (after/before → preceded-by/followed-by) to align with the canonical 13-column schema.

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[augmentcode]

Review completed. 1 suggestion posted.

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[augmentcode]

The v0.2.1 date uses YYYY-MM-DD while prior entries use Mon DD, YYYY; consider standardizing the date format to keep the changelog consistent (and avoid surprises for any tooling that parses it).

Severity: low

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