docs(changelog): group decrypt cached XEdDSA verifier (whatsapp-rust#839)

[jlucaso1]

Summary

• Adds changelog/2026-06-11-verify-edwards-cache.mdx documenting the PreparedVerifyingKey cache and the −25% group_decrypt wall-time improvement from oxidezap/whatsapp-rust#839
• Registers the new entry in docs.json navigation (after the existing June 11 history-sync entry)

What changed in whatsapp-rust#839

• New PreparedVerifyingKey type exported from the protocol crate — caches (-A, A_compressed) per sign bit for a public key, avoiding two field inversions on every XEdDSA verification
• SenderKeyState::signing_key_verifier() — returns a memoized &PreparedVerifyingKey; eagerly seeded on receive-side state creation, lazy on send-side
• SenderKeyMessage::verify_signature_prepared() — verifies against the cached verifier
• group_decrypt now uses the cached path; plain verify_signature(&PublicKey) unchanged

Test plan

• Verify the new changelog page renders correctly in the Mintlify preview
• Confirm docs.json navigation order is correct (June 11 entries appear together at the top)

https://claude.ai/code/session_01EUmGaiVmhCT863dVekzVvz

---

Generated by Claude Code

---

Summary by cubic

Adds a new changelog entry documenting the cached XEdDSA verifier for group decrypt and its ~25% speedup, including PreparedVerifyingKey and related APIs. Updates docs.json to list the page alongside the other June 11, 2026 entries.

^{Written for commit d1806ff. Summary will update on new commits.}

[mintlify]

Preview deployment for your docs. Learn more about Mintlify Previews.

Project	Status	Preview	Updated (UTC)
whatsapp-rust	🟢 Ready	View Preview	Jun 11, 2026, 4:30 AM

💡 Tip: Enable Workflows to automatically generate PRs for you.

[coderabbitai]

Warning

Review limit reached

@jlucaso1, we couldn't start this review because you've reached your PR review rate limit.

More reviews will be available in 10 minutes and 58 seconds. Learn how PR review limits work.

Your organization has run out of usage credits. Purchase more in the billing tab.

⌛ How to resolve this issue?

After more reviews become available, a review can be triggered using the @coderabbitai review command as a PR comment. Alternatively, push new commits to this PR.

We recommend that you space out your commits to avoid hitting the rate limit.

🚦 How do rate limits work?

CodeRabbit enforces hourly rate limits for each developer per organization.

Our paid plans include higher PR review limits than trial, open-source, and free plans. In all cases, reviews become available again over time. During sustained high-volume PR review activity, CodeRabbit may temporarily slow when the next review becomes available.

Please see our Fair Usage Limits Policy for further information.

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: a3f44b72-8d03-4baa-8660-59e85cb2d3fd

📥 Commits

Reviewing files that changed from the base of the PR and between 64284d5 and d1806ff.

📒 Files selected for processing (2)

• changelog/2026-06-11-verify-edwards-cache.mdx
• docs.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/eager-cerf-zzmn5l

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[cubic-dev-ai]

No issues found across 2 files

_{Re-trigger cubic}