refactor(rng): converge ecdsa off legacy rand line

[EffortlessSteven]

Summary

• Converge uselesskey-ecdsa off the legacy rand_core 0.6 / rand_chacha 0.3 line onto the current rand_core 0.9 / rand_chacha 0.9 line
• Update AGENTS.md and CLAUDE.md ecosystem snapshot review dates

Replaces #261 (auto-closed when stacked base branch was deleted).

Stacked on #260 (now merged).

Test plan

• cargo xtask gate passes
• Deterministic fingerprint snapshots unchanged
• ECDSA fixtures produce identical output on new RNG line

[gemini-code-assist]

Warning

You have reached your daily quota limit. Please wait up to 24 hours and I will start processing your requests again!

[coderabbitai]

Warning

Rate limit exceeded

@EffortlessSteven has exceeded the limit for the number of commits that can be reviewed per hour. Please wait 6 minutes and 28 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.

ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 506084f1-caa6-4f8d-989f-908fbbee28e1

📥 Commits

Reviewing files that changed from the base of the PR and between cc15c6a and 02518cc.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (15)

• .claude/agent-swarm-workflow/README.md
• .claude/agent-swarm-workflow/agent-patterns.md
• .claude/agent-swarm-workflow/example-prompts.md
• .claude/agent-swarm-workflow/setup-script.sh
• .claude/agent-swarm-workflow/slash-commands/bulk-pr.md
• .claude/agent-swarm-workflow/slash-commands/quality-ratchet.md
• .claude/agent-swarm-workflow/slash-commands/tdd-fix.md
• .claude/agent-swarm-workflow/slash-commands/wave.md
• .claude/agent-swarm-workflow/slash-commands/worktree-pr.md
• AGENTS.md
• CLAUDE.md
• Cargo.toml
• crates/uselesskey-ecdsa/Cargo.toml
• crates/uselesskey-ecdsa/src/keypair.rs
• crates/uselesskey-ecdsa/tests/jwk_private.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch rng-converge-ecdsa

📝 Coding Plan

• Generate coding plan for human review comments

---

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.}