chore: establish chub go foundation

internal/platform/logging/logger.go

@@ -0,0 +1,15 @@
+package logging
+
+import (
+	"io"
+	"log/slog"
+)
+
+// New creates the process logger. Callers provide the sink so tests and the
+// command entry point do not need to share global logging state.
+func New(w io.Writer) *slog.Logger {
+	if w == nil {
+		w = io.Discard
+	}
+	return slog.New(slog.NewJSONHandler(w, &slog.HandlerOptions{Level: slog.LevelInfo}))
+}