[ninglinLiu]

Which issue does this PR close?

• Follow-up to chore(dev): fold the crate LICENSE/NOTICE check into licenses.py #3528, as suggested by @kevinjqliu in chore(dev): fold the crate LICENSE/NOTICE check into licenses.py #3528 (run licenses.py crates check in verify_rc.sh behind a --check_crate_licenses toggle).

What changes are included in this PR?

RC voters currently only get the "every publishable crate packages the root LICENSE and NOTICE" guarantee from CI. This adds it to dev/release/verify_rc.sh, run against the extracted source archive:

• New --check_crate_licenses <0|1> option (also accepts --check-crate-licenses), default 1, validated like the other boolean options.
• check_crate_licenses requires cargo and python3 and runs python3 <archive>/dev/release/licenses.py crates check. licenses.py resolves REPO_ROOT from its own path, so it checks the extracted archive rather than the local checkout.
• Usage text and dev/release/README.md document the option and default; the "skip everything" example passes --check_crate_licenses 0.

Are these changes tested?

Ran bash -n dev/release/verify_rc.sh, checked --help output and that invalid values (e.g. --check_crate_licenses 2) are rejected, and ran python3 dev/release/licenses.py crates check from a git archive extraction of this branch (the same invocation check_crate_licenses uses), which passes.

This PR was prepared with AI assistance and reviewed/tested by the author.

[dannycjones]

LGTM

[kevinjqliu]

LGTM!

thanks for following up with the fix 😄

[kevinjqliu]

👍