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/01_blockchain/4_consensus.md

@@ -0,0 +1,65 @@
+# Consensus Mechanism
+Understand AITBC's proof-of-authority consensus mechanism.
+
+## Overview
+
+AITBC uses a Proof-of-Authority (PoA) consensus mechanism with:
+- Fixed block time: 2 seconds
+- Authority set of validated proposers
+- Transaction finality on each block
+
+## Block Production
+
+### Proposer Selection
+
+Proposers take turns producing blocks in a round-robin fashion. Each proposer gets a fixed time slot.
+
+### Block Structure
+
+```json
+{
+  "header": {
+    "height": 100,
+    "timestamp": "2026-02-13T10:00:00Z",
+    "proposer": "ait-devnet-proposer-1",
+    "parent_hash": "0xabc123...",
+    "state_root": "0xdef456...",
+    "tx_root": "0xghi789..."
+  },
+  "transactions": [...],
+  "receipts": [...]
+}
+```
+
+## Consensus Rules
+
+1. **Block Time**: 2 seconds minimum
+2. **Block Size**: 1 MB maximum
+3. **Transactions**: 500 maximum per block
+4. **Fee**: Minimum 0 (configurable)
+
+## Validator Requirements
+
+| Requirement | Value |
+|-------------|-------|
+| Uptime | 99% minimum |
+| Latency | < 100ms to peers |
+| Stake | 1000 AITBC |
+
+## Fork Selection
+
+Longest chain rule applies:
+- Validators always extend the longest known chain
+- Reorgs occur only on conflicting blocks within the last 10 blocks
+
+## Finality
+
+Blocks are considered final after:
+- 1 confirmation for normal transactions
+- 3 confirmations for high-value transactions
+
+## Next
+
+- [Quick Start](./1_quick-start.md) — Get started
+- [Validator Operations](./5_validator.md) - Validator guide
+- [Networking](./6_networking.md) - P2P networking