Improve changelog automation prompt

[amyblais]

Summary

• Expanded system prompt with new instructions: blank-line rules between headings and content, DM/GM abbreviation expansion (DM → Direct Message, GM → Group Message), one-section-per-note rule, and a new instruction Test image #10 ("Focus")
• Added normalize_go_version() and extract_previous_go_version() helpers so the Go Version section always shows a concrete version number (looked up from the existing changelog when GO_VERSION is not provided)
• Feature release anchor/heading now uses the -feature-release suffix to match the ESR pattern, and includes the full release-policy URL
• CHANGELOG_PATH env var is now read in main() before building the Go section
• go_section output changed from a bullet point to a bare sentence matching Mattermost changelog convention

Test plan

• Run the script against a test milestone and verify the generated changelog entry matches the expected format
• Verify Go version normalization handles both go1.22.5 and v1.22.5 input formats
• Verify feature release heading includes the -feature-release anchor suffix

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 97dc4e32-e04e-40ec-b526-8845e2f83468

📥 Commits

Reviewing files that changed from the base of the PR and between 6e6ca68 and c0877e8.

📒 Files selected for processing (1)

• .github/scripts/generate_changelog.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[amyblais]

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Pull request overview

This PR updates the changelog generation script used by the docs repo workflow to (a) refine the AI system prompt used for release-note polishing and (b) improve Go version handling so the generated ### Go Version section includes a concrete version even when GO_VERSION isn’t provided.

Changes:

• Expanded the Claude system prompt with stricter formatting/terminology rules (including DM/GM expansion and one-section-per-note).
• Added helpers to normalize Go versions and to extract the previously documented Go version from the existing changelog when GO_VERSION is empty.
• Updated feature-release anchors/headings to use the -feature-release suffix and adjusted how the Go Version section is rendered.