Workload: UUIDv7 / HLC hot-path ingestion

[dexcompiler]

Epic: #58

Type: Scenario | Signal area: Correctness, Performance, Memory | Runtime mode: Both

Deliver

Sustained high-rate ID generation across threads/nodes, including overflow-edge behavior and drift-policy variants.

Signals to capture

Monotonicity violations, overflow handling regressions, throughput drops, excessive clock drift, contention hotspots.

Acceptance criteria

Validates ordering/correctness invariants and records ops/sec plus allocation behavior in artifacts.