chore: baseline snapshot before moderation-strictness feature

Repo .git was damaged (refs/ missing, index truncated, object store near-empty).
Repaired via git init (rebuilt refs), stale index preserved as .git/index.corrupt-20260910.bak,
then full worktree committed as a rollback baseline.

internal/tracing/tracing.go

@@ -0,0 +1,27 @@
+// Copyright 2022 E99p1ant. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package tracing
+
+import (
+	"github.com/pkg/errors"
+	"go.opentelemetry.io/otel"
+	stdout "go.opentelemetry.io/otel/exporters/stdout/stdouttrace"
+	"go.opentelemetry.io/otel/propagation"
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
+)
+
+func Init() (*sdktrace.TracerProvider, error) {
+	exporter, err := stdout.New(stdout.WithPrettyPrint())
+	if err != nil {
+		return nil, errors.Wrap(err, "create stdout exporter")
+	}
+	tp := sdktrace.NewTracerProvider(
+		sdktrace.WithSampler(sdktrace.AlwaysSample()),
+		sdktrace.WithBatcher(exporter),
+	)
+	otel.SetTracerProvider(tp)
+	otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))
+	return tp, nil
+}