ci: combine npm + cargo release workflows into one

[thedavidmeister]

Summary

The split `npm-package-release.yaml` + `cargo-publish.yaml` raced each other on the version-bump commit push to main. A shared concurrency group cancelled pending runs rather than queuing them, so cargo releases kept getting cancelled by newer npm runs (and vice versa) and `crates.io` / main `Cargo.toml` version drifted out of sync.

Merge them into a single `package-release.yaml` that:

• Detects npm and cargo content changes independently (hash compare vs the latest published artifact).
• Bumps and publishes each that changed, in one workflow run.
• Pushes both version-bump commits + tags in a single push, so npm and cargo can't race each other.

Test plan

After merge, the next change to either side bumps and publishes that side; a change to both sides bumps and publishes both in one run with a single push.

Generated with Claude Code.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: d82ac5fa-8023-449c-a981-36f9ef318a60

📥 Commits

Reviewing files that changed from the base of the PR and between 48316f8 and a009421.

📒 Files selected for processing (3)

• .github/workflows/cargo-publish.yaml
• .github/workflows/npm-package-release.yaml
• .github/workflows/package-release.yaml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-05-12-fix-cargo-publish-concurrency

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