Improve update-changelog command with better git workflow

[justin808]

Summary

Ports enhancements from Shakapacker PR #824 to improve the /update-changelog slash command:

• Explicit git fetch step: Always fetch origin/master first to ensure latest commits are available
• Consistent origin/master usage: Use origin/master instead of local master throughout to avoid missing recently merged PRs
• Automatic PR extraction: Use grep to extract ALL PR numbers from commit history automatically
• PR existence checking: Check if PRs are already documented before adding duplicates
• Version links documentation: Add detailed instructions for managing version comparison links
• Simplified linting: Use just yarn lint instead of multiple commands
• Better change identification: Provide keyword hints for identifying user-visible changes

Test plan

• Review the updated command documentation
• Verify formatting with Prettier
• Confirm pre-commit hooks pass
• Test the command with actual changelog updates

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between ee80bc2 and ec6cee1.

📒 Files selected for processing (1)

• .claude/commands/update-changelog.md (1 hunks)

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch justin808/port-changelog-cmd

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