fix(release): drop ${{ }} braces from a workflow_call output description

[dmccaffery]

GitHub evaluates ${{ }} expressions inside a workflow_call output description. The release_created output description embedded a literal if: ${{ needs.release.outputs.release_created }} as caller guidance, but the needs context is out of scope there, so GitHub rejected release.yaml as an invalid workflow file. Every run that reaches it (self-release and any consumer caller) startup-failed with zero jobs from e0317e4 onward.

Drop the braces from the example (and the matching lead-in comment); a job-level if: needs none. Add a note so the braces do not creep back in.

[github-actions]

Note

Merging this PR: this repository merges by fast-forward so every
commit keeps its original signature. The GitHub merge button is not used.
Once this PR is approved and all checks pass, a maintainer merges it by
commenting /merge on the PR.

The branch must be up to date with main (rebased and re-signed) to
fast-forward. If /merge reports it is not fast-forwardable, rebase onto
main and comment /merge again.

[dmccaffery]

/auto-merge

[bitwise-fast-forward-merge]

Note

Auto-merge armed. Once this PR is approved and every required check
passes, it will be fast-forwarded into the base branch automatically,
preserving every commit signature.

Remove the auto-merge label to cancel. If the branch is not
fast-forwardable, rebase onto the base branch and re-sign — CI re-runs
and the merge retries.

[bitwise-fast-forward-merge]

Fast-forwarded main to e148d2c0905c — original signature preserved, no re-sign.