feat: add Fhenix FHE devcontainers with embedded LocalFhenix

[drewstone]

Summary

• Add multi-stage Dockerfiles for Fhenix FHE (Fully Homomorphic Encryption) development
• Extract and flatten LocalFhenix components from ghcr.io/fhenixprotocol/fhenix-devnet:0.1.6 into our foundry base
• No Docker-in-Docker required - all services run directly in the devcontainer

Components Extracted

Component	Size	Purpose
evmosd	63MB	FHE-enabled Evmos daemon (EVM node)
zbc-oracle-db	18MB	FHE Oracle database
zbc-fhe-tool	9MB	FHE tooling
faucet.js	-	Faucet server (port 6000)
encryption_server.py	-	Python encryption service

Variants

• fhenix-hardhat: Hardhat + Fhenix plugins + embedded LocalFhenix
• fhenix-foundry: Foundry + cofhe-foundry-mocks + embedded LocalFhenix

Usage

# Inside container - start LocalFhenix
/opt/fhenix/scripts/start-localfhenix.sh

# RPC: http://127.0.0.1:8545
# Faucet: curl http://127.0.0.1:6000/faucet?address=YOUR_ADDRESS

Test plan

• Build fhenix-hardhat Dockerfile
• Build fhenix-foundry Dockerfile
• Start LocalFhenix inside container
• Deploy sample FHE contract

🤖 Generated with Claude Code