```

chore: remove obsolete files and add Solidity build artifacts to .gitignore

- Add ignore patterns for Solidity build artifacts (typechain-types, artifacts, cache)
- Remove unused exchange mock API server (api/exchange_mock_api.py)
- Remove obsolete client-web README placeholder
- Remove deprecated marketplace-ui HTML implementation
```

docs/reference/components/wallet_daemon.md

@@ -0,0 +1,53 @@
+# Wallet Daemon – Task Breakdown
+
+## Status (2025-12-22)
+
+- **Stage 1**: ✅ **DEPLOYED** - Wallet Daemon successfully deployed in production at https://aitbc.bubuit.net/wallet/
+  - FastAPI application running in Incus container on port 8002
+  - Encrypted keystore with Argon2id + XChaCha20-Poly1305 implemented
+  - REST and JSON-RPC APIs operational
+  - Mock ledger with SQLite backend functional
+  - Receipt verification using aitbc_sdk integrated
+  - nginx proxy configured at /wallet/ route
+
+## Stage 1 (MVP) - COMPLETED
+
+- **Project Setup**
+  - ✅ Initialize FastAPI application under `apps/wallet-daemon/src/app/` with `main.py`, `settings.py`, `api_rest.py`, `api_jsonrpc.py`.
+  - ✅ Create crypto and keystore modules implementing Argon2id key derivation and XChaCha20-Poly1305 encryption.
+  - ✅ Add dependencies: FastAPI, uvicorn, argon2-cffi, pynacl, aitbc-sdk, aitbc-crypto, pydantic-settings.
+
+- **Keystore & Security**
+  - ✅ Implement encrypted wallet file format storing metadata, salt, nonce, ciphertext.
+  - ✅ Provide REST endpoints to create/import wallets, unlock/lock, derive accounts.
+  - ✅ Enforce unlock TTL and in-memory zeroization of sensitive data.
+
+- **REST & JSON-RPC APIs**
+  - ✅ Implement REST routes: wallet lifecycle, account derivation, signing (message/tx/receipt), mock ledger endpoints.
+  - ✅ Mirror functionality via JSON-RPC under `/rpc`.
+  - ✅ Authentication token header enforcement and rate limits on signing operations.
+
+- **Mock Ledger**
+  - ✅ Implement SQLite-backed ledger with balances and transfers for local testing.
+  - ✅ Provide REST endpoints to query balances and submit transfers.
+
+- **Documentation & Examples**
+  - ✅ Update deployment documentation with systemd service and nginx proxy configuration.
+  - ✅ Document production endpoints and API access via https://aitbc.bubuit.net/wallet/
+- **Receipts**
+  - ✅ Integrate `ReceiptVerifierService` consuming `CoordinatorReceiptClient` to fetch and validate receipts (miner + coordinator signatures).
+
+## Production Deployment Details
+
+- **Container**: Incus container 'aitbc' at `/opt/wallet-daemon/`
+- **Service**: systemd service `wallet-daemon.service` enabled and running
+- **Port**: 8002 (internal), proxied via nginx at `/wallet/`
+- **Dependencies**: Virtual environment with all required packages installed
+- **Access**: https://aitbc.bubuit.net/wallet/docs for API documentation
+
+## Stage 2+ - IN PROGRESS
+
+- Add ChainAdapter interface targeting real blockchain node RPC.
+  - 🔄 Implement mock adapter first, followed by AITBC node adapter.
+- Support hardware-backed signing (YubiKey/PKCS#11) and multi-curve support gating.
+- Introduce webhook retry/backoff logic and structured logging with request IDs.