feat(metrics): record eventsourced pg outbox publishes and retries

NewEventsourcedMetrics now handles pg.OutboxPublish (eventsourced.outbox.publish.duration, by event.type and success) and pg.OutboxRetry (eventsourced.outbox.retries, by event.type and permanent), so a service using the pg/v2 outbox can alert on failing or abandoned publishes. OutboxBatch and OutboxCleanup stay ignored.

otelsetup now imports codeberg.org/eventsourced/pg/v2 (v2.1.1). Every current consumer already depends on it; a release raises their minimum to v2.1.1.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013DJouG8ZZZxKtodF9kDvzj

metrics_test.go

@@ -7,6 +7,7 @@ import (
 	"time"
 
 	"codeberg.org/eventsourced/eventsourced"
+	"codeberg.org/eventsourced/pg/v2"
 	"go.opentelemetry.io/otel"
 	sdkmetric "go.opentelemetry.io/otel/sdk/metric"
 	"go.opentelemetry.io/otel/sdk/metric/metricdata"
@@ -33,6 +34,8 @@ func TestNewEventsourcedMetrics_RecordsContract(t *testing.T) {
 		eventsourced.SnapshotStored{AggregateType: "Entry", Duration: time.Millisecond, Success: true},
 		eventsourced.SnapshotLoaded{AggregateType: "Entry", Found: false, Duration: time.Millisecond},
 		eventsourced.IdempotencyCheck{AggregateType: "Entry", Hit: true},
+		pg.OutboxPublish{EventType: "EntryAdded", Success: false, Duration: time.Millisecond},
+		pg.OutboxRetry{EventType: "EntryAdded", RetryCount: 1},
 		unknownMetric{},
 	} {
 		r.Record(context.Background(), m)
@@ -57,6 +60,8 @@ func TestNewEventsourcedMetrics_RecordsContract(t *testing.T) {
 		"eventsourced.snapshot.store.duration",
 		"eventsourced.snapshot.load.duration",
 		"eventsourced.idempotency.checks",
+		"eventsourced.outbox.publish.duration",
+		"eventsourced.outbox.retries",
 	}
 	var missing []string
 	for _, w := range want {