Upgrade mimalloc to v2.2.7 and log active memory allocator (#876)

- Upgrade mimalloc from v2.1.2 to v2.2.7. Note that mimalloc is no longer the default allocator so this only impacts users who somehow opt into mimalloc via `--malloc=mimalloc` or compile with different defaults
- Add all available mimalloc versions (1.6.7–3.2.8) to the package definition for testing
- Log the active memory allocator (with version where available) at server startup
- Annotate vendored rpmalloc with its source commit and version

## Notable changes in mimalloc 2.1.2 → 2.2.7

- **Memory release fix** (2.2.4): fix case where OS memory was not always fully released
- **Race condition fix** (2.2.6): fixed rare race condition and potential buffer overflow in debug statistics
- **Windows arm64 support** (2.1.9)
- **Guarded build** (2.1.9): new build mode that places OS guard pages behind objects to catch buffer overflows
- **THP awareness** (2.2.6): auto-detects transparent huge pages and adjusts purge size to avoid fragmentation
- **Faster TLS access on Windows** (2.2.6)
- **Improved calloc and aligned allocation performance** (2.2.6)
- **New diagnostic APIs** (2.2.2): `mi_options_print`, `mi_arenas_print`, `mi_stat_get` / `mi_stat_get_json`
- **macOS**: use `MADV_FREE_REUSABLE` for better memory behavior (2.2.4)
- **Build fixes**: Android, Xbox, musl, mingw, arm32, Debian 32-bit, non-BMI1 x64 systems

## Allocator logging

Added `FMalloc::GetName()` pure virtual so the server logs which allocator is active at startup:
```
zenserver - memory allocator: mimalloc 2.2.7
```

Allocator names include version where available:
- `mimalloc 2.2.7` (runtime version via `mi_version()`)
- `rpmalloc 1.5.0-dev.20250810` (ad-hoc version from vendored develop branch commit)
- `ansi`, `stomp` (no version info available)

## Test plan

- [x] Builds successfully on Windows (release)
- [x] Verify server startup log shows allocator name
- [x] Test with `--malloc=mimalloc` (default) and `--malloc=rpmalloc`
- [x] Run test suites to check for regressions

13 files changed, 68 insertions, 29 deletions

diff --git a/src/zencore/include/zencore/memory/fmalloc.h b/src/zencore/include/zencore/memory/fmalloc.h
index c50a9729c..8ce4f7acd 100644
--- a/src/zencore/include/zencore/memory/fmalloc.h
+++ b/src/zencore/include/zencore/memory/fmalloc.h
@@ -151,6 +151,8 @@ public:
 
 	virtual void Trim(bool bTrimThreadCaches);
 
+	virtual const char* GetName() const = 0;
+
 	virtual void OutOfMemory(size_t Size, uint32_t Alignment);
 };
 
diff --git a/src/zencore/include/zencore/memory/mallocansi.h b/src/zencore/include/zencore/memory/mallocansi.h
index 510695c8c..cbc69caed 100644
--- a/src/zencore/include/zencore/memory/mallocansi.h
+++ b/src/zencore/include/zencore/memory/mallocansi.h
@@ -20,12 +20,13 @@ class FMallocAnsi final : public FMalloc
 public:
 	FMallocAnsi();
 
-	virtual void* Malloc(size_t Size, uint32_t Alignment) override;
-	virtual void* TryMalloc(size_t Size, uint32_t Alignment) override;
-	virtual void* Realloc(void* Ptr, size_t NewSize, uint32_t Alignment) override;
-	virtual void* TryRealloc(void* Ptr, size_t NewSize, uint32_t Alignment) override;
-	virtual void  Free(void* Ptr) override;
-	virtual bool  GetAllocationSize(void* Original, size_t& SizeOut) override;
+	virtual void*		Malloc(size_t Size, uint32_t Alignment) override;
+	virtual void*		TryMalloc(size_t Size, uint32_t Alignment) override;
+	virtual void*		Realloc(void* Ptr, size_t NewSize, uint32_t Alignment) override;
+	virtual void*		TryRealloc(void* Ptr, size_t NewSize, uint32_t Alignment) override;
+	virtual void		Free(void* Ptr) override;
+	virtual bool		GetAllocationSize(void* Original, size_t& SizeOut) override;
+	virtual const char* GetName() const override;
 };
 
 }  // namespace zen
diff --git a/src/zencore/include/zencore/memory/mallocmimalloc.h b/src/zencore/include/zencore/memory/mallocmimalloc.h
index 759eeb4a6..aa11d51d7 100644
--- a/src/zencore/include/zencore/memory/mallocmimalloc.h
+++ b/src/zencore/include/zencore/memory/mallocmimalloc.h
@@ -20,15 +20,16 @@ class FMallocMimalloc final : public FMalloc
 {
 public:
 	FMallocMimalloc();
-	virtual void* Malloc(size_t Size, uint32_t Alignment) override;
-	virtual void* TryMalloc(size_t Size, uint32_t Alignment) override;
-	virtual void* Realloc(void* Ptr, size_t NewSize, uint32_t Alignment) override;
-	virtual void* TryRealloc(void* Ptr, size_t NewSize, uint32_t Alignment) override;
-	virtual void  Free(void* Ptr) override;
-	virtual void* MallocZeroed(size_t Count, uint32_t Alignment) override;
-	virtual void* TryMallocZeroed(size_t Count, uint32_t Alignment) override;
-	virtual bool  GetAllocationSize(void* Original, size_t& SizeOut) override;
-	virtual void  Trim(bool bTrimThreadCaches) override;
+	virtual void*		Malloc(size_t Size, uint32_t Alignment) override;
+	virtual void*		TryMalloc(size_t Size, uint32_t Alignment) override;
+	virtual void*		Realloc(void* Ptr, size_t NewSize, uint32_t Alignment) override;
+	virtual void*		TryRealloc(void* Ptr, size_t NewSize, uint32_t Alignment) override;
+	virtual void		Free(void* Ptr) override;
+	virtual void*		MallocZeroed(size_t Count, uint32_t Alignment) override;
+	virtual void*		TryMallocZeroed(size_t Count, uint32_t Alignment) override;
+	virtual bool		GetAllocationSize(void* Original, size_t& SizeOut) override;
+	virtual void		Trim(bool bTrimThreadCaches) override;
+	virtual const char* GetName() const override;
 };
 
 }  // namespace zen
diff --git a/src/zencore/include/zencore/memory/mallocrpmalloc.h b/src/zencore/include/zencore/memory/mallocrpmalloc.h
index be2627b2d..718b7c095 100644
--- a/src/zencore/include/zencore/memory/mallocrpmalloc.h
+++ b/src/zencore/include/zencore/memory/mallocrpmalloc.h
@@ -21,15 +21,16 @@ class FMallocRpmalloc final : public FMalloc
 public:
 	FMallocRpmalloc();
 	~FMallocRpmalloc();
-	virtual void* Malloc(size_t Size, uint32_t Alignment) override;
-	virtual void* TryMalloc(size_t Size, uint32_t Alignment) override;
-	virtual void* Realloc(void* Ptr, size_t NewSize, uint32_t Alignment) override;
-	virtual void* TryRealloc(void* Ptr, size_t NewSize, uint32_t Alignment) override;
-	virtual void  Free(void* Ptr) override;
-	virtual void* MallocZeroed(size_t Count, uint32_t Alignment) override;
-	virtual void* TryMallocZeroed(size_t Count, uint32_t Alignment) override;
-	virtual bool  GetAllocationSize(void* Original, size_t& SizeOut) override;
-	virtual void  Trim(bool bTrimThreadCaches) override;
+	virtual void*		Malloc(size_t Size, uint32_t Alignment) override;
+	virtual void*		TryMalloc(size_t Size, uint32_t Alignment) override;
+	virtual void*		Realloc(void* Ptr, size_t NewSize, uint32_t Alignment) override;
+	virtual void*		TryRealloc(void* Ptr, size_t NewSize, uint32_t Alignment) override;
+	virtual void		Free(void* Ptr) override;
+	virtual void*		MallocZeroed(size_t Count, uint32_t Alignment) override;
+	virtual void*		TryMallocZeroed(size_t Count, uint32_t Alignment) override;
+	virtual bool		GetAllocationSize(void* Original, size_t& SizeOut) override;
+	virtual void		Trim(bool bTrimThreadCaches) override;
+	virtual const char* GetName() const override;
 };
 
 }  // namespace zen
diff --git a/src/zencore/include/zencore/memory/mallocstomp.h b/src/zencore/include/zencore/memory/mallocstomp.h
index 5d83868bb..ed0617c95 100644
--- a/src/zencore/include/zencore/memory/mallocstomp.h
+++ b/src/zencore/include/zencore/memory/mallocstomp.h
@@ -92,7 +92,8 @@ public:
 	 * @param SizeOut - If possible, this value is set to the size of the passed in pointer
 	 * @return true if succeeded
 	 */
-	virtual bool GetAllocationSize(void* Original, size_t& SizeOut) override;
+	virtual bool		GetAllocationSize(void* Original, size_t& SizeOut) override;
+	virtual const char* GetName() const override;
 };
 
 }  // namespace zen
diff --git a/src/zencore/memory/fmalloc.cpp b/src/zencore/memory/fmalloc.cpp
index 3e96003f5..b64fe1f2e 100644
--- a/src/zencore/memory/fmalloc.cpp
+++ b/src/zencore/memory/fmalloc.cpp
@@ -56,8 +56,9 @@ class FInitialMalloc : public FMalloc
 		Memory::Initialize();
 		return GMalloc->GetAllocationSize(Original, SizeOut);
 	}
-	virtual void OnMallocInitialized() override {}
-	virtual void Trim(bool bTrimThreadCaches) override { ZEN_UNUSED(bTrimThreadCaches); }
+	virtual void		OnMallocInitialized() override {}
+	virtual void		Trim(bool bTrimThreadCaches) override { ZEN_UNUSED(bTrimThreadCaches); }
+	virtual const char* GetName() const override { return "initial"; }
 } GInitialMalloc;
 
 FMalloc* GMalloc = &GInitialMalloc; /* Memory allocator */
diff --git a/src/zencore/memory/mallocansi.cpp b/src/zencore/memory/mallocansi.cpp
index 9c3936172..e9465b46b 100644
--- a/src/zencore/memory/mallocansi.cpp
+++ b/src/zencore/memory/mallocansi.cpp
@@ -248,4 +248,10 @@ FMallocAnsi::GetAllocationSize(void* Original, size_t& SizeOut)
 #endif
 }
 
+const char*
+FMallocAnsi::GetName() const
+{
+	return "ansi";
+}
+
 }  // namespace zen
diff --git a/src/zencore/memory/mallocmimalloc.cpp b/src/zencore/memory/mallocmimalloc.cpp
index 1f9aff404..1679eebde 100644
--- a/src/zencore/memory/mallocmimalloc.cpp
+++ b/src/zencore/memory/mallocmimalloc.cpp
@@ -191,6 +191,18 @@ FMallocMimalloc::Trim(bool bTrimThreadCaches)
 	mi_collect(bTrimThreadCaches);
 }
 
+const char*
+FMallocMimalloc::GetName() const
+{
+	static char Name[32] = {};
+	if (Name[0] == '\0')
+	{
+		int Ver = mi_version();
+		snprintf(Name, sizeof(Name), "mimalloc %d.%d.%d", Ver / 100, (Ver / 10) % 10, Ver % 10);
+	}
+	return Name;
+}
+
 #	undef DEBUG_FILL_FREED
 #	undef DEBUG_FILL_NEW
 
diff --git a/src/zencore/memory/mallocrpmalloc.cpp b/src/zencore/memory/mallocrpmalloc.cpp
index c45186b77..6c7bfe4f5 100644
--- a/src/zencore/memory/mallocrpmalloc.cpp
+++ b/src/zencore/memory/mallocrpmalloc.cpp
@@ -186,5 +186,10 @@ FMallocRpmalloc::Trim(bool bTrimThreadCaches)
 {
 	ZEN_UNUSED(bTrimThreadCaches);
 }
+const char*
+FMallocRpmalloc::GetName() const
+{
+	return "rpmalloc 1.5.0-dev.20250810";
+}
 }  // namespace zen
 #endif
diff --git a/src/zencore/memory/mallocstomp.cpp b/src/zencore/memory/mallocstomp.cpp
index db9e1535e..54153cbd4 100644
--- a/src/zencore/memory/mallocstomp.cpp
+++ b/src/zencore/memory/mallocstomp.cpp
@@ -278,6 +278,12 @@ FMallocStomp::GetAllocationSize(void* Original, size_t& SizeOut)
 	return true;
 }
 
+const char*
+FMallocStomp::GetName() const
+{
+	return "stomp";
+}
+
 }  // namespace zen
 
 #endif	// WITH_MALLOC_STOMP
diff --git a/src/zencore/memtrack/memorytrace.cpp b/src/zencore/memtrack/memorytrace.cpp
index 065a6f8ec..13abf7275 100644
--- a/src/zencore/memtrack/memorytrace.cpp
+++ b/src/zencore/memtrack/memorytrace.cpp
@@ -201,6 +201,7 @@ private:
 	virtual void  Free(void* Address) override;
 	virtual bool  GetAllocationSize(void* Address, SIZE_T& SizeOut) override { return InnerMalloc->GetAllocationSize(Address, SizeOut); }
 	virtual void  OnMallocInitialized() override { InnerMalloc->OnMallocInitialized(); }
+	virtual const char* GetName() const override { return InnerMalloc->GetName(); }
 
 	FMalloc* InnerMalloc;
 };
diff --git a/src/zencore/memtrack/tracemalloc.h b/src/zencore/memtrack/tracemalloc.h
index f82d630d7..017962d08 100644
--- a/src/zencore/memtrack/tracemalloc.h
+++ b/src/zencore/memtrack/tracemalloc.h
@@ -16,7 +16,8 @@ public:
 	virtual void* Realloc(void* Original, size_t Count, uint32_t Alignment) override;
 	virtual void  Free(void* Original) override;
 
-	virtual void OnMallocInitialized() override { WrappedMalloc->OnMallocInitialized(); }
+	virtual void		OnMallocInitialized() override { WrappedMalloc->OnMallocInitialized(); }
+	virtual const char* GetName() const override { return WrappedMalloc->GetName(); }
 
 	FMalloc* WrappedMalloc;
 };
diff --git a/src/zenserver/zenserver.cpp b/src/zenserver/zenserver.cpp
index fe6a5a572..49cbbb9fc 100644
--- a/src/zenserver/zenserver.cpp
+++ b/src/zenserver/zenserver.cpp
@@ -479,9 +479,9 @@ ZenServerBase::BuildSettingsList(const ZenServerConfig& ServerConfig)
 		{"ContentDir"sv, 			fmt::format("{}", ServerConfig.ContentDir)},
 		{"BasePort"sv, 				fmt::to_string(ServerConfig.BasePort)},
 		{"CoreLimit"sv, 			fmt::to_string(ServerConfig.CoreLimit)},
+		{"MemoryAllocator"sv,		std::string(GMalloc->GetName())},
 		{"IsDebug"sv, 				fmt::to_string(ServerConfig.IsDebug)},
 		{"IsCleanStart"sv, 			fmt::to_string(ServerConfig.IsCleanStart)},
-		{"IsPowerCycle"sv, 			fmt::to_string(ServerConfig.IsPowerCycle)},
 		{"IsTest"sv, 				fmt::to_string(ServerConfig.IsTest)},
 		{"Detach"sv, 				fmt::to_string(ServerConfig.Detach)},
 		{"NoConsoleOutput"sv, 		fmt::to_string(ServerConfig.LoggingConfig.NoConsoleOutput)},
@@ -739,6 +739,7 @@ ZenServerMain::Run()
 		ZEN_INFO(ZEN_APP_NAME " - using lock file at '{}'", LockFilePath);
 
 		ZEN_INFO(ZEN_APP_NAME " - starting on port {}, version '{}'", m_ServerOptions.BasePort, ZEN_CFG_VERSION_BUILD_STRING_FULL);
+		ZEN_INFO(ZEN_APP_NAME " - memory allocator: {}", GMalloc->GetName());
 
 		Entry = ServerState.Register(m_ServerOptions.BasePort);