Add r30rg — chaos engineering for Arbitrum rollup stacks

[copyleftdev]

What is r30rg?

r30rg is a Rust-based chaos engineering framework purpose-built for Arbitrum Nitro rollup stacks.

It operates in two tiers:

• Live Chaos — kills Docker containers, injects network partitions, probes invariants across L1/L2/L3 via Ethereum RPC (8 adversarial scenarios)
• Deterministic Simulation — TigerBeetle-style VOPR: time-compressed model of the full rollup stack with fault injection, bridge messaging, retryable tickets, and 8 invariants checked every tick. Millions of seeds in minutes.

Additional features:

• Simulation shrinking — delta-debugging to find minimal fault sets that reproduce violations
• Bridge stress testing — L1↔L2 deposit/withdrawal with balance conservation checks
• Timeboost auction probing — express lane monopolization detection, reserve price invariants
• Fully deterministic (same seed = same chaos), JSON output for CI pipelines

MIT licensed.