Add r30rg — chaos testing for Arbitrum rollup stacks

[copyleftdev]

What is r30rg?

r30rg is a Rust-based chaos and adversarial testing framework for Arbitrum Nitro rollup stacks.

Two testing tiers:

• Live Chaos — 8 adversarial scenarios that kill Docker containers, inject network partitions, and probe invariants across L1/L2/L3 via Ethereum RPC
• Deterministic Simulation — TigerBeetle-style VOPR with fault injection, bridge messaging, retryable tickets, and 8 invariants checked every tick

Key capabilities:

• Simulation shrinking (delta-debugging to minimal fault sets)
• Bridge stress testing (L1↔L2 deposit/withdrawal, balance conservation)
• Timeboost auction probing (express lane monopolization, reserve price invariants)
• Fully deterministic: same seed = same chaos
• JSON output for CI/CD integration

MIT licensed. Placed alphabetically in Bug finding tools.

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