Shared extension runtime; core observer config exposed as readonly views

0.2.2

Patch Changes

• #4240 7210789 Thanks @dustinbyrne! - Add the shared extension runtime and CoreExtension capability contract, expose core observer and configuration payloads as deeply readonly views, allow key-value stores to return values synchronously or asynchronously, and expose host API response details. Nullish values passed to set follow host-native storage semantics; use remove to delete a key. (2026-07-27)