docs: fix stale core/sdk package names in release.yml comment

[toon-backlog-bot]

Summary

• Fixes a stale header comment in .github/workflows/release.yml (line 3) that referenced @toon-protocol/core and @toon-protocol/sdk — leftovers from before the polyrepo split.
• This repo's workspace packages are @toon-protocol/relay and @toon-protocol/bls (per root package.json workspaces and CLAUDE.md); core/sdk are published from a different repo.
• No other occurrences of the stale core/sdk publish-comment text remain in .github/workflows/ (verified via grep).
• Comment-only change — no workflow behavior change.

Closes #42

Verification

• pnpm install — succeeds
• pnpm -r build — both packages/relay and packages/bls build successfully
• pnpm -r test — 140 tests pass (relay) + 221 tests pass (bls), all green
• YAML re-parsed with python3 -c "import yaml; yaml.safe_load(...)" — parses cleanly
• Added an empty changeset (.changeset/issue-42-fix-stale-release-comment.md) since this is a docs-only, non-package change per repo convention

Note: this sandbox didn't have devbox available, so verification ran with pnpm directly (via corepack) rather than devbox run — the change is comment-only with no behavior impact, so this should be equivalent.

🤖 Generated with Claude Code

[ALLiDoizCode]

Verified: the corrected comment (@toon-protocol/relay and @toon-protocol/bls) matches the actual workspace packages published by this workflow's pnpm changeset publish step, and grepping all workflow files confirms no other stale core/sdk references remain. Changeset follows the repo's existing empty-frontmatter convention for docs-only changes. PR title and body accurately describe the diff and match issue #42. Comment-only change, no behavior impact. No blocking issues.