fix: Restore logger in native client wrappers to fix AccessViolationException (v4.0.1-beta)

CRITICAL HOTFIX for v4.0.0-beta regression

Root Cause:
- v4.0.0-beta removed StderrLogReceiver from Historical, Live, and LiveBlocking client wrappers
- Passed nullptr to databento-cpp constructors instead of logger instance
- databento-cpp tried to log messages without null-checking the logger pointer
- Result: AccessViolationException crashes when logging attempted

Symptoms:
- Fatal crashes on ALL Historical API queries
- Crashes on Live and LiveBlocking subscriptions
- Particularly common when databento-cpp tried to log warnings or errors
- Multiple user reports immediately after v4.0.0-beta release

Fixes Applied:
- historical_client_wrapper.cpp: Restored log_receiver member and initialization
- live_client_wrapper.cpp: Restored log_receiver and SetLogReceiver() call
- live_blocking_wrapper.cpp: Restored log_receiver and SetLogReceiver() call
- Rebuilt databento_native.dll with all fixes

Changes:
- src/Databento.Native/src/historical_client_wrapper.cpp
- src/Databento.Native/src/live_client_wrapper.cpp
- src/Databento.Native/src/live_blocking_wrapper.cpp
- src/Databento.Interop/runtimes/win-x64/native/databento_native.dll
- src/Databento.Client/Databento.Client.csproj (version 4.0.0-beta → 4.0.1-beta)
- CHANGELOG.md (added v4.0.1-beta entry)

Testing:
- TestsScratchpad.Internal now runs successfully
- Logger output visible: "[Databento WARNING]" messages appear correctly
- No crashes on queries that previously failed

All users on v4.0.0-beta should upgrade immediately.

Author: Serha

CHANGELOG.md

@@ -5,6 +5,20 @@ 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).
 
+## [4.0.1-beta] - 2025-11-25
+
+### Fixed
+
+- **CRITICAL**: Fixed `AccessViolationException` crash in Historical, Live, and LiveBlocking clients
+  - **Root Cause**: v4.0.0-beta removed logger from native client wrappers, passing `nullptr` to databento-cpp
+  - **Symptoms**: Fatal crashes when databento-cpp tried to log messages (particularly on empty query results or warnings)
+  - **Impact**: Affected ALL Historical API queries, Live subscriptions, and LiveBlocking operations in v4.0.0-beta
+  - **Fix**: Restored `StderrLogReceiver` logger in all three client wrapper implementations
+  - **User Reports**: Multiple users reported crashes immediately after upgrading to v4.0.0-beta
+  - **Recommendation**: All users on v4.0.0-beta should upgrade to v4.0.1-beta immediately
+
+---
+
 ## [4.0.0-beta] - 2025-11-25
 
 ### Changed (BREAKING)

src/Databento.Client/Databento.Client.csproj

@@ -9,7 +9,7 @@
 
     <!-- Package Information -->
     <PackageId>Databento.Client</PackageId>
-    <Version>4.0.0-beta</Version>
+    <Version>4.0.1-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>v4.0.0-beta: BREAKING CHANGE - RawInstrumentId changed from uint to ulong for 64-bit venue support (Eurex, etc.). Change uint to ulong in your code. New examples: IntradayReplay2, Get_Most_Recent_Market_Open, List_Available_Schemas. See MIGRATION_GUIDE_v4.md.</PackageReleaseNotes>
+    <PackageReleaseNotes>v4.0.1-beta: CRITICAL HOTFIX - Fixed AccessViolationException crash in Historical, Live, and LiveBlocking clients by restoring logger. Regression from v4.0.0-beta. All users on v4.0.0-beta should upgrade immediately.</PackageReleaseNotes>
     <PackageRequireLicenseAcceptance>false</PackageRequireLicenseAcceptance>
 
     <!-- XML Documentation -->

src/Databento.Interop/runtimes/win-x64/native/databento_native.dll

@@ -30,11 +30,13 @@ using databento_native::ValidateTimeRange;
 struct HistoricalClientWrapper {
     std::unique_ptr<db::Historical> client;
     std::string api_key;
+    std::unique_ptr<databento_native::StderrLogReceiver> log_receiver;
 
     explicit HistoricalClientWrapper(const std::string& key)
-        : api_key(key) {
+        : api_key(key),
+          log_receiver(std::make_unique<databento_native::StderrLogReceiver>()) {
         client = std::make_unique<db::Historical>(
-            nullptr,
+            log_receiver.get(),
             key,
             db::HistoricalGateway::Bo1
         );

src/Databento.Native/src/historical_client_wrapper.cpp

@@ -23,14 +23,16 @@ using databento_native::ValidateNonEmptyString;
 // ============================================================================
 struct LiveBlockingWrapper {
     std::unique_ptr<db::LiveBlocking> client;
+    std::unique_ptr<databento_native::StderrLogReceiver> log_receiver;
     std::string dataset;
     std::string api_key;
     bool send_ts_out = false;
     db::VersionUpgradePolicy upgrade_policy = db::VersionUpgradePolicy::UpgradeToV3;
     int heartbeat_interval_secs = 30;
 
     explicit LiveBlockingWrapper(const std::string& key)
-        : api_key(key) {}
+        : api_key(key),
+          log_receiver(std::make_unique<databento_native::StderrLogReceiver>()) {}
 
     explicit LiveBlockingWrapper(
         const std::string& key,
@@ -39,6 +41,7 @@ struct LiveBlockingWrapper {
         db::VersionUpgradePolicy policy,
         int heartbeat_secs)
         : api_key(key),
+          log_receiver(std::make_unique<databento_native::StderrLogReceiver>()),
           dataset(ds),
           send_ts_out(ts_out),
           upgrade_policy(policy),
@@ -51,7 +54,8 @@ struct LiveBlockingWrapper {
                 .SetKey(api_key)
                 .SetDataset(dataset)
                 .SetSendTsOut(send_ts_out)
-                .SetUpgradePolicy(upgrade_policy);
+                .SetUpgradePolicy(upgrade_policy)
+                .SetLogReceiver(log_receiver.get());
 
             if (heartbeat_interval_secs > 0) {
                 builder.SetHeartbeatInterval(std::chrono::seconds(heartbeat_interval_secs));

src/Databento.Native/src/live_blocking_wrapper.cpp

@@ -27,6 +27,7 @@ using databento_native::ValidateSymbolArray;
 // ============================================================================
 struct LiveClientWrapper {
     std::unique_ptr<db::LiveThreaded> client;
+    std::unique_ptr<databento_native::StderrLogReceiver> log_receiver;
     RecordCallback record_callback = nullptr;
     MetadataCallback metadata_callback = nullptr;
     ErrorCallback error_callback = nullptr;
@@ -41,7 +42,8 @@ struct LiveClientWrapper {
     int heartbeat_interval_secs = 30;
 
     explicit LiveClientWrapper(const std::string& key)
-        : api_key(key) {}
+        : api_key(key),
+          log_receiver(std::make_unique<databento_native::StderrLogReceiver>()) {}
 
     explicit LiveClientWrapper(
         const std::string& key,
@@ -50,6 +52,7 @@ struct LiveClientWrapper {
         db::VersionUpgradePolicy policy,
         int heartbeat_secs)
         : api_key(key),
+          log_receiver(std::make_unique<databento_native::StderrLogReceiver>()),
           dataset(ds),
           send_ts_out(ts_out),
           upgrade_policy(policy),
@@ -67,7 +70,8 @@ struct LiveClientWrapper {
                 .SetKey(api_key)
                 .SetDataset(dataset)
                 .SetSendTsOut(send_ts_out)
-                .SetUpgradePolicy(upgrade_policy);
+                .SetUpgradePolicy(upgrade_policy)
+                .SetLogReceiver(log_receiver.get());
 
             if (heartbeat_interval_secs > 0) {
                 builder.SetHeartbeatInterval(