style: gofmt all packages (#4)

Applies gofmt to the 18 files that were already unformatted at HEAD (pre-existing debt — 122 insertions / 122 deletions, whitespace plus import-block reorderings only; `git diff -w` confirms no semantic changes).

Kept on its own branch so the functional change set (see the review-hardening PR) stays reviewable without formatting noise.

Verified: go build, go vet, go test ./... pass on this branch; a merge simulation with the functional branch produces a clean 3-way merge with all tests green.
Reviewed-on: #4
Co-authored-by: David Gwilliam <dhgwilliam@gmail.com>
Co-committed-by: David Gwilliam <dhgwilliam@gmail.com>

internal/metrics/metrics.go

@@ -19,23 +19,23 @@ import (
 // scrape-time gauges derived from the database (refreshed on each scrape).
 type Metrics struct {
 	// Gossip counters (live).
-	pullsTotal          prometheus.Counter
-	pushesTotal         prometheus.Counter
-	obsPulledTotal      prometheus.Counter
-	obsPushedTotal      prometheus.Counter
-	errorsTotal         prometheus.Counter
+	pullsTotal     prometheus.Counter
+	pushesTotal    prometheus.Counter
+	obsPulledTotal prometheus.Counter
+	obsPushedTotal prometheus.Counter
+	errorsTotal    prometheus.Counter
 
 	// Snapshot gauges (updated per scrape).
-	observationsGauge      *prometheus.GaugeVec
-	entriesGauge           prometheus.Gauge
-	projectsGauge          prometheus.Gauge
-	sessionsGauge          prometheus.Gauge
-	pendingReflections     prometheus.Gauge
-	peersGauge             prometheus.Gauge
-	threadsByStatus        *prometheus.GaugeVec
-	byOriginNode           *prometheus.GaugeVec
-	knowledgeVector        *prometheus.GaugeVec
-	observationsLast24h    prometheus.Gauge
+	observationsGauge   *prometheus.GaugeVec
+	entriesGauge        prometheus.Gauge
+	projectsGauge       prometheus.Gauge
+	sessionsGauge       prometheus.Gauge
+	pendingReflections  prometheus.Gauge
+	peersGauge          prometheus.Gauge
+	threadsByStatus     *prometheus.GaugeVec
+	byOriginNode        *prometheus.GaugeVec
+	knowledgeVector     *prometheus.GaugeVec
+	observationsLast24h prometheus.Gauge
 
 	registry *prometheus.Registry
 	kdb      *db.KnoxDB
@@ -161,4 +161,4 @@ func (m *Metrics) Handler() http.Handler {
 		}
 		h.ServeHTTP(w, r)
 	})
-}
+}