release: 2.54.0 - #3592

Reviewed the release metadata and the complete v2.53.0...d5a38aa release delta. The 2.53.1 patch bump is consistent across the manifest, changelog, package metadata, runtime version, and lockfile; dependencies and public runtime behavior are unchanged apart from version. Generated artifact changes are attribution-only, provenance is intact, and local build/import/lock validation passed.

The 2.54.0 changelog lists the same 0652787 Responses model-identifier feature twice. Both bullets describe and link to the same commit; the second only adds the #3595 link. This would publish duplicate release notes for the release’s sole feature. Please collapse these into one PR-linked entry and fix/regenerate the Release Please input so the duplicate does not return.

The prior release-note blocker remains unresolved on this head: the 2.54.0 changelog still lists the same 0652787 Responses model-identifier feature twice. Both bullets describe and link to the same commit; the second only adds the #3595 link. Please collapse these into one PR-linked entry and fix/regenerate the Release Please input so the duplicate does not return.