ReplicaWeave — op-CRDT schema & TestCartridge spec (prototype)

This repository provides a focused, well-tested Python prototype for two core pieces of the ReplicaWeave idea:

• An op-based CRDT delta schema (op types, deterministic merge, compact merkle-style ops root).
• A deterministic TestCartridge spec and small harness that runs cartridges with seeded inputs to produce reproducible TestReports and Scorecards.

This prototype is intended as a solid chunk for the larger ReplicaWeave system (Genome Lab test cartridges, Scorecards, signed Manifests). It is intentionally minimal but production-minded: it includes a Python package layout, signing utilities, deterministic behavior, and tests.

What you'll find here

• src/idea189_replicaweave_safe_mutation/: core library
• tests/: pytest test suite
• test.sh: runs tests and builds the package
• AGENTS.md: contributor instructions

Quick usage (from repo root):

1. Install package in editable mode:

   python3 -m pip install -e .

2. Run tests:

   pytest

3. Build the package metadata and sdist/wheel:

   python3 -m build

Core concepts implemented

• Op-CRDT: op records, Delta merging with deterministic ordering and an ops_root function.
• TestCartridge: small, composable cartridges that run deterministically from a seed and return TestReports (score, logs, counterexample seed).
• Harness: deterministic runner that runs cartridges against deltas and emits signed Manifests.
• Scorecard: JSON schema describing safety_score, resource impact, reproducible failures.
• Simple signing (Ed25519) for Manifests / TestReports.

This is a foundation — next agents can add a WASM runner, richer policy checks, marketplace UI, and certification pipeline.