[DO NOT MERGE] v1.1.0 Simulation-only wallet runtime bytecode for accurate VGL estimation (bundler overrides)

[amiecorso]

Summary

Adds simulation-only runtime bytecode and docs for use in producing accurate Verification Gas Limit (VGL) estimates for passkey (WebAuthn) flows via bundler overrides of CoinbaseSmartWallet implementations.

see #138 for v1.0.0 simulation bytecode

Motivation

Simulations necessarily use invalid passkey signatures. Invalid signatures take different verification paths than real valid signatures onchain, causing large gas deviations. (e.g., RIP-7212 precompile falls back to heavy FCL path during simulation but does not with a valid signature during execution.). This PR provides fake, simulation-friendly bytecode that forces the “valid signature” path so bundlers can estimate VGL accurately without manual buffers, instead passing this simulation bytecode as a state override to the bundler.

What’s in this PR

• verifySim wired in CoinbaseSmartWallet to ignore provided WebAuthn signature data at the final check and instead use a known-valid P‑256 vector so simulation follows the same path as real execution.
• Deployed/runtime bytecode exported for bundler overrides:
  • snapshots/SimulationOverrides/CoinbaseSmartWallet.runtime.hex
• README section explaining purpose, build settings, and usage.

Usage (bundler overrides)

• During eth_estimateUserOperationGas for passkey flows:
  • Override CoinbaseSmartWallet implementation address(es) with the bytecode in snapshots/SimulationOverrides/CoinbaseSmartWallet.runtime.hex.
  • Affected CoinbaseSmartWallet versions:
    • v1.0.0 (0x000100abaad02f1cfC8Bbe32bD5a564817339E72)
    • v1.1.0 (0x00000110dCdEdC9581cb5eCB8467282f2926534d)
  • Continue providing a dummy signature for calldata parity; verifySim ensures the verification path succeeds to mirror onchain valid-signature behavior.

Simulation-only! Do not deploy

[cb-heimdall]

🟡 Heimdall Review Status

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Reviews	🟡 0/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1

[amiecorso]

This is the output we need to pass as bundler override to eth_estimateUserOperationGas