test: Pin date-time format precision tolerance#102
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The OpenAPI 'date-time' string format delegates to OffsetDateTime.parse, which already accepts everything from second precision through nanosecond precision (and either Z or numeric offset). Pin that behaviour so we can keep emitting Java's natural toString() form on responses without fear of clients sending higher-precision timestamps back to us.
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Java's OffsetDateTime/Instant/ZonedDateTime/LocalDateTime/LocalTime toString() omits seconds and fractional digits when zero, producing inconsistent serialised forms (e.g. "20:00Z" vs "20:00:00.123456Z"). Encode through a DateTimeFormatter that always writes six-digit (microsecond) fractional precision. Decoding remains permissive via each type's ISO parser.