chore: initialize monorepo with project scaffolding, configs, and CI setup

apps/blockchain-node/scripts/mock_coordinator.py

@@ -0,0 +1,38 @@
+#!/usr/bin/env python3
+"""Mock coordinator API for devnet testing."""
+
+from __future__ import annotations
+
+from typing import Dict
+
+from fastapi import FastAPI
+
+app = FastAPI(title="Mock Coordinator API", version="0.1.0")
+
+MOCK_JOBS: Dict[str, Dict[str, str]] = {
+    "job_1": {"status": "complete", "price": "50000", "compute_units": 2500},
+    "job_2": {"status": "complete", "price": "25000", "compute_units": 1200},
+}
+
+
+@app.get("/health")
+def health() -> Dict[str, str]:
+    return {"status": "ok"}
+
+
+@app.post("/attest/receipt")
+def attest_receipt(payload: Dict[str, str]) -> Dict[str, str | bool]:
+    job_id = payload.get("job_id")
+    if job_id in MOCK_JOBS:
+        return {
+            "exists": True,
+            "paid": True,
+            "not_double_spent": True,
+            "quote": MOCK_JOBS[job_id],
+        }
+    return {
+        "exists": False,
+        "paid": False,
+        "not_double_spent": False,
+        "quote": {},
+    }