v28.2.2

• Consume SemanticConventions 15.0.0 and its generated Weaver v2 validation configuration.
• Probe fresh NuGet indexes during release verification instead of accepting stale CDN responses.
• Preserve compiler-host helper exclusions when an isolated NuGet cache has no trailing directory separator.
• Preserve nullable annotations on generated receivers, parameters and returns, including nullable generic arguments and array ranks. Keep overload matching annotation-insensitive.
• Remove blanket warning suppression from generated interceptors and build metadata. Scope obsolete warnings to their forwarded calls while retaining diagnostics at the original caller.
• Leave optional argument defaults with the original method instead of copying them into interceptor declarations.
• Verify generated consumers with warnings as errors in the normal pre-push gate. Exclude unused filesystem guards from the compiler-host generator assembly.