v14.0.0

• Keep resource metadata in its attribute collection instead of duplicating semantic-convention vocabulary in never-populated flattened fields and closed provider/language enums. SemanticConventions owns the generated vocabulary.
• Remove unused session-event, log-template and span-statistics DTOs and unused error, event-domain and span-flag enums. Verify cross-language serialization with the runner log response that the API actually serves.
• Preserve producer severity text as a string, allow arbitrary instrumentation library versions, expose scope/resource schema URLs and use unsigned 32-bit span/link/log flags.
• Declare the NuGet package's Apache-2.0 license metadata.
• Preserve metric resource and instrumentation scope metadata, expose complete conflicting instrument descriptors, and allow an exact series_id selector on range and saved queries. Ambiguous range queries can return 409.
• Represent unknown historical log observation timestamps and unnamed instrumentation scopes without inventing values.
• Make unknown log event and streaming timestamps optional and keep span start and end timestamps required.
• Expose paged original metric points with exact signed integers, unsigned counts, ordered exemplars, native exponential buckets and summary quantiles. Keep historical originals explicitly unknown and label derived range-query values as float64 projections.
• Generate typed nullable C# unions and support numeric variants shared between contract namespaces; verify the restored package with real JSON round trips.
• Enforce the exact signed and unsigned 64-bit ranges in JSON Schema and Zod decimal-string validators, matching .NET deserialization.
• Add an explicit response_too_large tool failure for an original record that cannot fit a complete MCP response; raw metric points must not be compacted into partial evidence.
• Pin .NET SDK 10.0.401 in global.json, matching the repository toolchain and preventing an installed preview SDK from being selected implicitly.