Logging and diagnostics improvements (#941)

Core logging and system diagnostics improvements, extracted from the compute branch.

### Logging
- **Elapsed timestamps**: Console log now shows elapsed time since launch `[HH:MM:SS.mmm]` instead of full date/time; file logging is unchanged
- **Short level names**: 3-letter short level names (`trc`/`dbg`/`inf`/`wrn`/`err`/`crt`) used by both console and file formatters via `ShortToStringView()`
- **Consistent field order**: Standardized to `[timestamp] [level] [logger]` across both console and file formatters
- **Slim LogMessage/LogPoint**: Remove redundant fields from `LogMessage` (derive level/source from `LogPoint`), flatten `LogPoint` to inline filename/line fields, shrink `LogLevel` to `int8_t` with `static_assert(sizeof(LogPoint) <= 32)`
- **Remove default member initializers** and static default `LogPoint` from `LogMessage` — all fields initialized by constructor
- **LoggerRef string constructor**: Convenience constructor accepting a string directly
- **Fix SendMessage macro collision**: Replace `thread.h` include in `logmsg.h` with a forward declaration of `GetCurrentThreadId()` to avoid pulling in `windows.h` transitively

### System Diagnostics
- **Cache static system metrics**: Add `RefreshDynamicSystemMetrics()` that only queries values that change at runtime (available memory, uptime, swap). `SystemMetricsTracker` snapshots full `GetSystemMetrics()` once at construction and reuses cached topology/total memory on each `Query()`, avoiding repeated `GetLogicalProcessorInformationEx` traversal on Windows, `/proc/cpuinfo` parsing on Linux, and `sysctl` topology calls on macOS

1 files changed, 37 insertions, 29 deletions

diff --git a/src/zencore/logging/ansicolorsink.cpp b/src/zencore/logging/ansicolorsink.cpp
index 03aae068a..1a8201876 100644
--- a/src/zencore/logging/ansicolorsink.cpp
+++ b/src/zencore/logging/ansicolorsink.cpp
@@ -5,6 +5,7 @@
 #include <zencore/logging/messageonlyformatter.h>
 
 #include <zencore/thread.h>
+#include <zencore/timer.h>
 
 #include <cstdio>
 #include <cstdlib>
@@ -22,48 +23,37 @@
 
 namespace zen::logging {
 
-// Default formatter replicating spdlog's %+ pattern:
-// [YYYY-MM-DD HH:MM:SS.mmm] [logger_name] [level] message\n
+// Default formatter for console output:
+// [HH:MM:SS.mmm] [logger_name] [level] message\n
+// Timestamps show elapsed time since process launch.
 class DefaultConsoleFormatter : public Formatter
 {
 public:
+	DefaultConsoleFormatter() : m_Epoch(std::chrono::system_clock::now() - std::chrono::milliseconds(GetTimeSinceProcessStart())) {}
+
 	void Format(const LogMessage& Msg, MemoryBuffer& Dest) override
 	{
-		// timestamp
-		auto Secs = std::chrono::duration_cast<std::chrono::seconds>(Msg.GetTime().time_since_epoch());
-		if (Secs != m_LastLogSecs)
-		{
-			m_LastLogSecs	= Secs;
-			m_CachedLocalTm = helpers::SafeLocaltime(LogClock::to_time_t(Msg.GetTime()));
-		}
+		// Elapsed time since process launch
+		auto Elapsed   = Msg.GetTime() - m_Epoch;
+		auto TotalSecs = std::chrono::duration_cast<std::chrono::seconds>(Elapsed);
+		int	 Count	   = static_cast<int>(TotalSecs.count());
+		int	 LogSecs   = Count % 60;
+		Count /= 60;
+		int LogMins	 = Count % 60;
+		int LogHours = Count / 60;
 
 		Dest.push_back('[');
-		helpers::AppendInt(m_CachedLocalTm.tm_year + 1900, Dest);
-		Dest.push_back('-');
-		helpers::Pad2(m_CachedLocalTm.tm_mon + 1, Dest);
-		Dest.push_back('-');
-		helpers::Pad2(m_CachedLocalTm.tm_mday, Dest);
-		Dest.push_back(' ');
-		helpers::Pad2(m_CachedLocalTm.tm_hour, Dest);
+		helpers::Pad2(LogHours, Dest);
 		Dest.push_back(':');
-		helpers::Pad2(m_CachedLocalTm.tm_min, Dest);
+		helpers::Pad2(LogMins, Dest);
 		Dest.push_back(':');
-		helpers::Pad2(m_CachedLocalTm.tm_sec, Dest);
+		helpers::Pad2(LogSecs, Dest);
 		Dest.push_back('.');
 		auto Millis = helpers::TimeFraction<std::chrono::milliseconds>(Msg.GetTime());
 		helpers::Pad3(static_cast<uint32_t>(Millis.count()), Dest);
 		Dest.push_back(']');
 		Dest.push_back(' ');
 
-		// logger name
-		if (Msg.GetLoggerName().size() > 0)
-		{
-			Dest.push_back('[');
-			helpers::AppendStringView(Msg.GetLoggerName(), Dest);
-			Dest.push_back(']');
-			Dest.push_back(' ');
-		}
-
 		// level
 		Dest.push_back('[');
 		if (IsColorEnabled())
@@ -78,6 +68,25 @@ public:
 		Dest.push_back(']');
 		Dest.push_back(' ');
 
+		using namespace std::literals;
+
+		// logger name
+		if (Msg.GetLoggerName().size() > 0)
+		{
+			if (IsColorEnabled())
+			{
+				Dest.append("\033[97m"sv);
+			}
+			Dest.push_back('[');
+			helpers::AppendStringView(Msg.GetLoggerName(), Dest);
+			Dest.push_back(']');
+			if (IsColorEnabled())
+			{
+				Dest.append("\033[0m"sv);
+			}
+			Dest.push_back(' ');
+		}
+
 		// message (align continuation lines with the first line)
 		size_t AnsiBytes	   = IsColorEnabled() ? (helpers::AnsiColorForLevel(Msg.GetLevel()).size() + helpers::kAnsiReset.size()) : 0;
 		size_t LinePrefixCount = Dest.size() - AnsiBytes;
@@ -128,8 +137,7 @@ public:
 	}
 
 private:
-	std::chrono::seconds m_LastLogSecs{0};
-	std::tm				 m_CachedLocalTm{};
+	LogClock::time_point m_Epoch;
 };
 
 bool