Core implementation for high-performance unique identifiers.

Provides functions for generating and manipulating Flakes - 192-bit identifiers
that combine nanosecond timestamps with high-entropy random data to ensure
both uniqueness and monotonic ordering properties.

Internal implementation of high-performance time-ordered Flake IDs.

## Architecture

A Flake is a 192-bit (24-byte) identifier:
- 64-bit nanosecond-precision timestamp
- 128-bit random component (two 64-bit longs)

## Encoding

String representation uses custom base-64:
- Alphabet: -0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz
- 24 bytes → 32 characters
- Preserves lexical ordering
- URL-safe (no +, / characters)

## Thread Safety

- ThreadLocal RNG for lock-free generation
- Nanoclock provides monotonicity within thread
- Cross-thread ordering via timestamp component

## Performance

- Generation: ~300ns (no locks, pure CPU)
- Encoding: ~500ns (custom algorithm)
- Parsing: ~600ns (with validation)

This is an internal namespace. Use com.vadelabs.uid.flake.core for public API.

Implementation inspired by μ/log (mulog) by Bruno Bonacci:
https://github.com/BrunoBonacci/mulog/blob/master/mulog-core/src/com/brunobonacci/mulog/flakes.clj
Licensed under Apache License 2.0

High-precision timestamp provider combining wall clock and monotonic timing.

This implementation anchors to the system wall clock at initialization,
then uses monotonic timing to provide nanosecond-precision timestamps
that maintain consistent intervals.

Key characteristics:
- Nanosecond resolution for timestamp generation
- Monotonic properties within process lifetime
- Wall-clock anchored for cross-system compatibility
- Single global instance for consistency

Note: This is not a high-precision wall clock replacement. While it provides
nanosecond granularity, it can drift from true wall time over extended periods
as monotonic clocks don't adjust for NTP synchronization.

Timestamp range extends to approximately year 2262 when using nanosecond
precision in a long value.