# MercuriusMesh — Cross-Venue Market Microstructure Sandbox (Phase 0)

This repository contains a Phase 0 implementation of MercuriusMesh: a deterministic,
offline-first sandbox for cross-venue market microstructure experiments.

What is included
- Core pydantic contracts: LocalBook, OrderEvent, QuoteSnapshot, SharedSignals, PlanDelta
- A tiny deterministic two-venue simulator and toy adapters
- Tests validating model serialization and deterministic replay

Run tests and build
1. Install dev deps: `pip install -r requirements.txt` or `pip install pydantic pytest build`
2. Run `bash test.sh` which runs `pytest` and `python3 -m build`

This is a focused chunk (Phase 0). Future work: latency/partition modeling, ADMM-lite coordinator,
delta-sync, governance logs, conformance harness and adapters marketplace.