docs: update release instructions in CONTRIBUTING.md

[FBumann]

Summary

• Replace stale manual git tag release instructions with current release-please process

Test plan

• Documentation-only change

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: a4e6cabd-9b6b-4973-bc43-747f0c30101e

📥 Commits

Reviewing files that changed from the base of the PR and between 7da7121 and 68d6434.

📒 Files selected for processing (1)

• CONTRIBUTING.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch docs/update-contributing

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