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

examples/receipts-sign-verify/README.md

@@ -0,0 +1,39 @@
+# Receipts Sign & Verify Examples
+
+This directory contains sample scripts demonstrating how to interact with the
+coordinator receipt endpoints and validate miner/coordinator signatures.
+
+## Prerequisites
+
+- Python 3.11+
+- Coordinator API running locally (defaults to `http://localhost:8011`)
+- Client API key with access to the coordinator (defaults to
+  `client_dev_key_1` in development fixtures)
+
+Install the helper packages:
+
+```bash
+poetry install --directory packages/py/aitbc-crypto
+poetry install --directory packages/py/aitbc-sdk
+```
+
+## Fetch and Verify
+
+`fetch_and_verify.py` fetches either the latest receipt or the entire receipt
+history for a job, then verifies miner signatures and optional coordinator
+attestations.
+
+```bash
+export PYTHONPATH=packages/py/aitbc-sdk/src:packages/py/aitbc-crypto/src
+python examples/receipts-sign-verify/fetch_and_verify.py --job-id <job_id> \
+  --coordinator http://localhost:8011 --api-key client_dev_key_1
+```
+
+Use `--history` to iterate over all stored receipts:
+
+```bash
+python examples/receipts-sign-verify/fetch_and_verify.py --job-id <job_id> --history
+```
+
+The script prints whether the miner signature and each coordinator attestation
+validated successfully.