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

apps/wallet-daemon/README.md

@@ -0,0 +1,32 @@
+# Wallet Daemon
+
+## Purpose & Scope
+
+Local FastAPI service that manages encrypted keys, signs transactions/receipts, and exposes wallet RPC endpoints. Reference `docs/bootstrap/wallet_daemon.md` for the implementation plan.
+
+## Development Setup
+
+- Create a Python virtual environment under `apps/wallet-daemon/.venv` or use Poetry.
+- Install dependencies via Poetry (preferred):
+  ```bash
+  poetry install
+  ```
+- Copy/create `.env` and configure coordinator access:
+  ```bash
+  cp .env.example .env  # create file if missing
+  ```
+  - `COORDINATOR_BASE_URL` (default `http://localhost:8011`)
+  - `COORDINATOR_API_KEY` (development key to verify receipts)
+- Run the service locally:
+  ```bash
+  poetry run uvicorn app.main:app --host 0.0.0.0 --port 8071 --reload
+  ```
+- REST receipt endpoints:
+  - `GET /v1/receipts/{job_id}` (latest receipt + signature validations)
+  - `GET /v1/receipts/{job_id}/history` (full history + validations)
+- JSON-RPC interface (`POST /rpc`):
+  - Method `receipts.verify_latest`
+  - Method `receipts.verify_history`
+- Keystore scaffolding:
+  - `KeystoreService` uses Argon2id + XChaCha20-Poly1305 via `app/crypto/encryption.py` (in-memory for now).
+  - Future milestones will add persistent storage and wallet lifecycle routes.