Add group metadata persistence and session checkpoint recovery

[wksantiago]

Summary

• Add persistent storage for group metadata (threshold, participants, coordinator)
• Add session checkpoint with group name for crash recovery
• Fix storage layout overlap between metadata and checkpoint regions
• Add nonce reuse protection in session resume

Test plan

• Native tests pass (test_session, test_storage)
• Manual test DKG flow with metadata persistence
• Test session checkpoint and resume after crash

[coderabbitai]

Warning

Rate limit exceeded

@kwsantiago has exceeded the limit for the number of commits that can be reviewed per hour. Please wait 2 minutes and 24 seconds before requesting another review.

⌛ How to resolve this issue?

After the wait time has elapsed, 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 have higher rate limits than the trial, open-source and free plans. In all cases, we re-allow further reviews after a brief timeout.

Please see our FAQ for further information.

📥 Commits

Reviewing files that changed from the base of the PR and between df09711 and 86e7e2b.

⛔ Files ignored due to path filters (1)

• partitions.csv is excluded by !**/*.csv

📒 Files selected for processing (14)

• main/frost_dkg.c
• main/frost_signer.c
• main/frost_signer.h
• main/main.c
• main/protocol.c
• main/protocol.h
• main/session.c
• main/session.h
• main/storage.c
• main/storage.h
• test/native/test_frost_signer_core.c
• test/native/test_integration.c
• test/native/test_session.c
• test/native/test_storage.c

---

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.}

[kwsantiago]

@coderabbitai review

[coderabbitai]

✅ Actions performed

Review triggered.

Note: CodeRabbit is an incremental review system and does not re-review already reviewed commits. This command is applicable only when automatic reviews are paused.