feat: implement AITBC mesh network deployment infrastructure

✅ Phase 0: Pre-implementation checklist completed
- Environment configurations (dev/staging/production)
- Directory structure setup (logs, backups, monitoring)
- Virtual environment with dependencies

✅ Master deployment script created
- Single command deployment with validation
- Progress tracking and rollback capability
- Health checks and deployment reporting

✅ Validation script created
- Module import validation
- Basic functionality testing
- Configuration and script verification

✅ Implementation fixes
- Fixed dataclass import in consensus keys
- Fixed async function syntax in tests
- Updated deployment script for virtual environment

🚀 Ready for deployment: ./scripts/deploy-mesh-network.sh dev

apps/blockchain-node/src/aitbc_chain/consensus/rotation.py

@@ -0,0 +1,146 @@
+"""
+Validator Rotation Mechanism
+Handles automatic rotation of validators based on performance and stake
+"""
+
+import asyncio
+import time
+from typing import List, Dict, Optional
+from dataclasses import dataclass
+from enum import Enum
+
+from .multi_validator_poa import MultiValidatorPoA, Validator, ValidatorRole
+
+class RotationStrategy(Enum):
+    ROUND_ROBIN = "round_robin"
+    STAKE_WEIGHTED = "stake_weighted"
+    REPUTATION_BASED = "reputation_based"
+    HYBRID = "hybrid"
+
+@dataclass
+class RotationConfig:
+    strategy: RotationStrategy
+    rotation_interval: int  # blocks
+    min_stake: float
+    reputation_threshold: float
+    max_validators: int
+
+class ValidatorRotation:
+    """Manages validator rotation based on various strategies"""
+    
+    def __init__(self, consensus: MultiValidatorPoA, config: RotationConfig):
+        self.consensus = consensus
+        self.config = config
+        self.last_rotation_height = 0
+        
+    def should_rotate(self, current_height: int) -> bool:
+        """Check if rotation should occur at current height"""
+        return (current_height - self.last_rotation_height) >= self.config.rotation_interval
+    
+    def rotate_validators(self, current_height: int) -> bool:
+        """Perform validator rotation based on configured strategy"""
+        if not self.should_rotate(current_height):
+            return False
+        
+        if self.config.strategy == RotationStrategy.ROUND_ROBIN:
+            return self._rotate_round_robin()
+        elif self.config.strategy == RotationStrategy.STAKE_WEIGHTED:
+            return self._rotate_stake_weighted()
+        elif self.config.strategy == RotationStrategy.REPUTATION_BASED:
+            return self._rotate_reputation_based()
+        elif self.config.strategy == RotationStrategy.HYBRID:
+            return self._rotate_hybrid()
+        
+        return False
+    
+    def _rotate_round_robin(self) -> bool:
+        """Round-robin rotation of validator roles"""
+        validators = list(self.consensus.validators.values())
+        active_validators = [v for v in validators if v.is_active]
+        
+        # Rotate roles among active validators
+        for i, validator in enumerate(active_validators):
+            if i == 0:
+                validator.role = ValidatorRole.PROPOSER
+            elif i < 3:  # Top 3 become validators
+                validator.role = ValidatorRole.VALIDATOR
+            else:
+                validator.role = ValidatorRole.STANDBY
+        
+        self.last_rotation_height += self.config.rotation_interval
+        return True
+    
+    def _rotate_stake_weighted(self) -> bool:
+        """Stake-weighted rotation"""
+        validators = sorted(
+            [v for v in self.consensus.validators.values() if v.is_active],
+            key=lambda v: v.stake,
+            reverse=True
+        )
+        
+        for i, validator in enumerate(validators[:self.config.max_validators]):
+            if i == 0:
+                validator.role = ValidatorRole.PROPOSER
+            elif i < 4:
+                validator.role = ValidatorRole.VALIDATOR
+            else:
+                validator.role = ValidatorRole.STANDBY
+        
+        self.last_rotation_height += self.config.rotation_interval
+        return True
+    
+    def _rotate_reputation_based(self) -> bool:
+        """Reputation-based rotation"""
+        validators = sorted(
+            [v for v in self.consensus.validators.values() if v.is_active],
+            key=lambda v: v.reputation,
+            reverse=True
+        )
+        
+        # Filter by reputation threshold
+        qualified_validators = [
+            v for v in validators 
+            if v.reputation >= self.config.reputation_threshold
+        ]
+        
+        for i, validator in enumerate(qualified_validators[:self.config.max_validators]):
+            if i == 0:
+                validator.role = ValidatorRole.PROPOSER
+            elif i < 4:
+                validator.role = ValidatorRole.VALIDATOR
+            else:
+                validator.role = ValidatorRole.STANDBY
+        
+        self.last_rotation_height += self.config.rotation_interval
+        return True
+    
+    def _rotate_hybrid(self) -> bool:
+        """Hybrid rotation considering both stake and reputation"""
+        validators = [v for v in self.consensus.validators.values() if v.is_active]
+        
+        # Calculate hybrid score
+        for validator in validators:
+            validator.hybrid_score = validator.stake * validator.reputation
+        
+        # Sort by hybrid score
+        validators.sort(key=lambda v: v.hybrid_score, reverse=True)
+        
+        for i, validator in enumerate(validators[:self.config.max_validators]):
+            if i == 0:
+                validator.role = ValidatorRole.PROPOSER
+            elif i < 4:
+                validator.role = ValidatorRole.VALIDATOR
+            else:
+                validator.role = ValidatorRole.STANDBY
+        
+        self.last_rotation_height += self.config.rotation_interval
+        return True
+
+# Default rotation configuration
+DEFAULT_ROTATION_CONFIG = RotationConfig(
+    strategy=RotationStrategy.HYBRID,
+    rotation_interval=100,  # Rotate every 100 blocks
+    min_stake=1000.0,
+    reputation_threshold=0.7,
+    max_validators=10
+)