Clarify the minimum npm versions supporting v1.0 @-prefixed component envelope fields #4223

The current upstream source supports @CatalogId, @accessibility, @metadata, and @Checks, but the published @a2ui/[email protected] package still uses bare component envelope keys.

Could you clarify the release status and minimum supported npm versions for these changes?

As of November 13, 2026:

• The latest npm version is 0.15.0, published on November 2.
• PR #4037, merged on November 11, added dual-read support for prefixed and legacy bare v1.0 component envelope keys.
• PR #4044 subsequently updated the specification, schemas, and emitted output to use the prefixed keys.
• I compared the installed message processor, payload validator, and common schema files against the official npm 0.15.0 tarball; they match.