chore: Release v3.0.28-beta - Clean databento-cpp rebuild

This is a maintenance release to replace v3.0.27-beta's native DLL
which inadvertently used a debug-modified databento-cpp dependency.

Changes:
- Rebuilt native DLL with clean databento-cpp v0.44.0 from upstream
- Updated version to 3.0.28-beta
- Updated README badge to v3.0.28-beta
- Updated CHANGELOG with v3.0.28-beta entry

All fixes remain identical to v3.0.27-beta:
- Issue #1: AccessViolationException with future dates - ✅ Verified
- Issue #4: InstrumentDefMessage.InstrumentClass always 0 - ✅ Verified

No code changes, only dependency cleanup for production use.

Author: Serha

CHANGELOG.md

@@ -5,6 +5,23 @@ All notable changes to databento-dotnet will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [3.0.28-beta] - 2025-11-23
+
+### Changed
+
+- **Native Library**: Rebuilt with clean, unmodified databento-cpp v0.44.0
+  - Previous v3.0.27-beta inadvertently included debug-modified databento-cpp dependency
+  - All functionality remains identical to v3.0.27-beta
+  - No code changes, only dependency cleanup
+
+### Notes
+
+This is a maintenance release to ensure production packages use official, unmodified upstream dependencies. All fixes from v3.0.27-beta are included and verified:
+- Issue #1: AccessViolationException with future dates - ✅ Working
+- Issue #4: InstrumentDefMessage.InstrumentClass always 0 - ✅ Working
+
+---
+
 ## [3.0.27-beta] - 2025-11-23
 
 ### Fixed

README.md

@@ -1,6 +1,6 @@
 # databento-dotnet
 
-[![NuGet](https://img.shields.io/badge/NuGet-v3.0.27--beta-blue)](https://www.nuget.org/packages/Databento.Client)
+[![NuGet](https://img.shields.io/badge/NuGet-v3.0.28--beta-blue)](https://www.nuget.org/packages/Databento.Client)
 [![Downloads](https://img.shields.io/badge/Downloads-3.5K-blue)](https://www.nuget.org/packages/Databento.Client)
 [![GitHub Release](https://img.shields.io/github/v/release/Alparse/databento-dotnet?include_prereleases&label=Release)](https://github.com/Alparse/databento-dotnet/releases)
 [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](LICENSE)

src/Databento.Client/Databento.Client.csproj

@@ -9,7 +9,7 @@
 
     <!-- Package Information -->
     <PackageId>Databento.Client</PackageId>
-    <Version>3.0.27-beta</Version>
+    <Version>3.0.28-beta</Version>
     <Authors>Alparse</Authors>
     <Company>Databento</Company>
     <Product>databento-dotnet</Product>
@@ -20,7 +20,7 @@
     <RepositoryType>git</RepositoryType>
     <PackageProjectUrl>https://github.com/Alparse/databento-dotnet</PackageProjectUrl>
     <PackageReadmeFile>README.md</PackageReadmeFile>
-    <PackageReleaseNotes>v3.0.27-beta: Critical fixes - Issue #1: Fixed AccessViolationException with future dates (NULL ILogReceiver). Issue #4: Fixed InstrumentDefMessage.InstrumentClass always returning 0, corrected all field offsets to DBN v2 spec, added 13 multi-leg strategy fields.</PackageReleaseNotes>
+    <PackageReleaseNotes>v3.0.28-beta: Same fixes as v3.0.27-beta with clean, unmodified databento-cpp v0.44.0 (previous version had debug-modified dependency). Issue #1: Fixed AccessViolationException with future dates. Issue #4: Fixed InstrumentDefMessage.InstrumentClass always returning 0.</PackageReleaseNotes>
     <PackageRequireLicenseAcceptance>false</PackageRequireLicenseAcceptance>
 
     <!-- XML Documentation -->

src/Databento.Interop/Databento.Interop.csproj

@@ -9,7 +9,7 @@
 
     <!-- Not packaged separately - embedded in Databento.Client -->
     <IsPackable>false</IsPackable>
-    <Version>3.0.27-beta</Version>
+    <Version>3.0.28-beta</Version>
   </PropertyGroup>
 
   <ItemGroup>