feat: implement v0.2.0 release features - agent-first evolution

✅ v0.2 Release Preparation:
- Update version to 0.2.0 in pyproject.toml
- Create release build script for CLI binaries
- Generate comprehensive release notes

✅ OpenClaw DAO Governance:
- Implement complete on-chain voting system
- Create DAO smart contract with Governor framework
- Add comprehensive CLI commands for DAO operations
- Support for multiple proposal types and voting mechanisms

✅ GPU Acceleration CI:
- Complete GPU benchmark CI workflow
- Comprehensive performance testing suite
- Automated benchmark reports and comparison
- GPU optimization monitoring and alerts

✅ Agent SDK Documentation:
- Complete SDK documentation with examples
- Computing agent and oracle agent examples
- Comprehensive API reference and guides
- Security best practices and deployment guides

✅ Production Security Audit:
- Comprehensive security audit framework
- Detailed security assessment (72.5/100 score)
- Critical issues identification and remediation
- Security roadmap and improvement plan

✅ Mobile Wallet & One-Click Miner:
- Complete mobile wallet architecture design
- One-click miner implementation plan
- Cross-platform integration strategy
- Security and user experience considerations

✅ Documentation Updates:
- Add roadmap badge to README
- Update project status and achievements
- Comprehensive feature documentation
- Production readiness indicators

🚀 Ready for v0.2.0 release with agent-first architecture

docs/advanced/03_architecture/4_blockchain-node.md

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+# Blockchain Node - AITBC Documentation
+
+PoA/PoS consensus blockchain with REST/WebSocket RPC, real-time gossip layer, and comprehensive observability
+
+<span class="status-badge live">● Live</span>
+
+## Overview
+
+The AITBC Blockchain Node is the core infrastructure component that maintains the distributed ledger. It implements a hybrid Proof-of-Authority/Proof-of-Stake consensus mechanism with fast finality and supports high throughput for AI workload transactions.
+
+### Key Features
+
+- Hybrid PoA/PoS consensus with sub-second finality
+- REST and WebSocket RPC APIs
+- Real-time gossip protocol for block propagation
+- Comprehensive observability with Prometheus metrics
+- SQLModel-based data persistence
+- Built-in devnet tooling and scripts
+
+## Architecture
+
+The blockchain node is built with a modular architecture separating concerns for consensus, storage, networking, and API layers.
+
+#### Consensus Engine
+Hybrid PoA/PoS with proposer rotation and validator sets
+
+#### Storage Layer
+SQLModel with SQLite/PostgreSQL support
+
+#### Networking
+WebSocket gossip + REST API
+
+#### Observability
+Prometheus metrics + structured logging
+
+## API Reference
+
+The blockchain node exposes both REST and WebSocket APIs for interaction.
+
+### REST Endpoints
+
+`GET /rpc/get_head`
+Get the latest block header
+
+`POST /rpc/send_tx`
+Submit a new transaction
+
+`GET /rpc/get_balance/{address}`
+Get account balance
+
+`GET /rpc/get_block/{height}`
+Get block by height
+
+### WebSocket Subscriptions
+
+- `new_blocks` - Real-time block notifications
+- `new_transactions` - Transaction pool updates
+- `consensus_events` - Consensus round updates
+
+## Configuration
+
+The node can be configured via environment variables or configuration file.
+
+### Key Settings
+
+```bash
+# Database
+DATABASE_URL=sqlite:///blockchain.db
+
+# Network
+RPC_HOST=0.0.0.0
+RPC_PORT=9080
+WS_PORT=9081
+
+# Consensus
+CONSENSUS_MODE=poa
+VALIDATOR_ADDRESS=0x...
+BLOCK_TIME=1s
+
+# Observability
+METRICS_PORT=9090
+LOG_LEVEL=info
+```
+
+## Running a Node
+
+### Development Mode
+
+```bash
+# Initialize devnet
+python -m blockchain.scripts.init_devnet
+
+# Start node
+python -m blockchain.main --config devnet.yaml
+```
+
+### Production Mode
+
+```bash
+# Using Docker
+docker run -d \
+  -v /data/blockchain:/data \
+  -p 9080:9080 \
+  -p 9081:9081 \
+  -p 9090:9090 \
+  aitbc/blockchain-node:latest
+```
+
+## Monitoring
+
+### Prometheus Metrics
+
+Available at `http://localhost:9090/metrics`
+
+Key metrics:
+- `blockchain_blocks_total` - Total blocks produced
+- `blockchain_transactions_total` - Total transactions processed
+- `blockchain_consensus_rounds` - Consensus rounds completed
+- `blockchain_network_peers` - Active peer connections
+
+### Health Checks
+
+```bash
+# Node status
+curl http://localhost:9080/health
+
+# Sync status
+curl http://localhost:9080/sync_status
+```
+
+## Troubleshooting
+
+### Common Issues
+
+1. **Node not syncing**
+   - Check peer connections: `curl /rpc/peers`
+   - Verify network connectivity
+   - Check logs for consensus errors
+
+2. **High memory usage**
+   - Reduce `block_cache_size` in config
+   - Enable block pruning
+
+3. **RPC timeouts**
+   - Increase `rpc_timeout` setting
+   - Check system resources
+
+## Development
+
+### Building from Source
+
+```bash
+git clone https://github.com/aitbc/blockchain
+cd blockchain
+pip install -e .
+```
+
+### Running Tests
+
+```bash
+# Unit tests
+pytest tests/
+
+# Integration tests
+pytest tests/integration/
+```
+
+## Security Considerations
+
+- Validator keys should be kept secure
+- Use HTTPS in production
+- Implement rate limiting on RPC endpoints
+- Regular security updates for dependencies