fix(#392): simplify uuid formatter — gofmt-clean loop

The hand-unrolled byte-pair version in reconciler.go tripped gofmt -s
and goimports. Replaced with the same loop-based formatter that
internal/library/eventbus.go uses — same behaviour, fewer lines, lint
clean. Two copies of the helper still exist (one per package) to keep
the no-back-edge property for both internal/library and
internal/lidarrrequests, but they're now identical and the duplication
is tiny.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

internal/lidarrrequests/reconciler.go

@@ -66,35 +66,19 @@ func formatUUIDForBus(u pgtype.UUID) string {
 	if !u.Valid {
 		return ""
 	}
-	return string([]byte{
-		hex(u.Bytes[0]>>4), hex(u.Bytes[0]&0xf),
-		hex(u.Bytes[1]>>4), hex(u.Bytes[1]&0xf),
-		hex(u.Bytes[2]>>4), hex(u.Bytes[2]&0xf),
-		hex(u.Bytes[3]>>4), hex(u.Bytes[3]&0xf),
-		'-',
-		hex(u.Bytes[4]>>4), hex(u.Bytes[4]&0xf),
-		hex(u.Bytes[5]>>4), hex(u.Bytes[5]&0xf),
-		'-',
-		hex(u.Bytes[6]>>4), hex(u.Bytes[6]&0xf),
-		hex(u.Bytes[7]>>4), hex(u.Bytes[7]&0xf),
-		'-',
-		hex(u.Bytes[8]>>4), hex(u.Bytes[8]&0xf),
-		hex(u.Bytes[9]>>4), hex(u.Bytes[9]&0xf),
-		'-',
-		hex(u.Bytes[10]>>4), hex(u.Bytes[10]&0xf),
-		hex(u.Bytes[11]>>4), hex(u.Bytes[11]&0xf),
-		hex(u.Bytes[12]>>4), hex(u.Bytes[12]&0xf),
-		hex(u.Bytes[13]>>4), hex(u.Bytes[13]&0xf),
-		hex(u.Bytes[14]>>4), hex(u.Bytes[14]&0xf),
-		hex(u.Bytes[15]>>4), hex(u.Bytes[15]&0xf),
-	})
-}
-
-func hex(b byte) byte {
-	if b < 10 {
-		return '0' + b
+	const hex = "0123456789abcdef"
+	out := make([]byte, 36)
+	pos := 0
+	for i, b := range u.Bytes {
+		if i == 4 || i == 6 || i == 8 || i == 10 {
+			out[pos] = '-'
+			pos++
+		}
+		out[pos] = hex[b>>4]
+		out[pos+1] = hex[b&0xf]
+		pos += 2
 	}
-	return 'a' + (b - 10)
+	return string(out)
 }
 
 // Run blocks until ctx is cancelled, ticking every r.tick. Errors from