fix: Showing beam heading on map even if no call is entered

internal/applog/applog.go

@@ -11,14 +11,16 @@ import (
 	"log"
 	"os"
 	"path/filepath"
+	"runtime/debug"
 	"sync"
 	"time"
 )
 
 var (
-	mu     sync.Mutex
-	file   *os.File
-	path   string
+	mu        sync.Mutex
+	file      *os.File
+	path      string
+	crashFile *os.File // kept open so the runtime can write a crash traceback to it
 )
 
 // Init opens (creates) the log file in dataDir. On rotation we truncate
@@ -57,6 +59,17 @@ func Init(dataDir string) (string, error) {
 	file = f
 	path = logPath
 
+	// Capture a full traceback on a FATAL crash (a Go panic that escapes our
+	// recover()s, or a runtime-fatal error like a concurrent map write, or a
+	// Windows access violation routed through the Go signal handler) into a
+	// dedicated file the runtime writes directly — so otherwise-silent process
+	// deaths leave a stack we can read.
+	if cf, cerr := os.OpenFile(filepath.Join(dataDir, "opslog-crash.log"),
+		os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0o644); cerr == nil {
+		crashFile = cf
+		_ = debug.SetCrashOutput(cf, debug.CrashOptions{})
+	}
+
 	// Redirect log.Print* and the standard logger to the file too, so
 	// any third-party output stays consistent.
 	log.SetOutput(io.MultiWriter(file, os.Stderr))