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}))
+}

internal/platform/logging/logger_test.go

@@ -0,0 +1,22 @@
+package logging
+
+import (
+	"bytes"
+	"strings"
+	"testing"
+)
+
+func TestNewWritesStructuredLog(t *testing.T) {
+	var output bytes.Buffer
+	logger := New(&output)
+	logger.Info("test event", "component", "test")
+
+	value := output.String()
+	if !strings.Contains(value, `"msg":"test event"`) || !strings.Contains(value, `"component":"test"`) {
+		t.Fatalf("log output = %q", value)
+	}
+}
+
+func TestNewNilWriterDoesNotPanic(t *testing.T) {
+	New(nil).Info("discarded")
+}