Phase 06 Tier 1: Complete Backend Implementation - Recovery Tracking & Swap System

COMPLETED TASKS:
✅ 06-01: Workout Swap System
   - Added swapped_from_id to workout_logs
   - Created workout_swaps table for history
   - POST /api/workouts/:id/swap endpoint
   - GET /api/workouts/available endpoint
   - Reversible swaps with audit trail

✅ 06-02: Muscle Group Recovery Tracking
   - Created muscle_group_recovery table
   - Implemented calculateRecoveryScore() function
   - GET /api/recovery/muscle-groups endpoint
   - GET /api/recovery/most-recovered endpoint
   - Auto-tracking on workout log completion

✅ 06-03: Smart Workout Recommendations
   - GET /api/recommendations/smart-workout endpoint
   - 7-day workout analysis algorithm
   - Recovery-based filtering (>30% threshold)
   - Top 3 recommendations with context
   - Context-aware reasoning messages

DATABASE CHANGES:
- Added 4 new tables: muscle_group_recovery, workout_swaps, custom_workouts, custom_workout_exercises
- Extended workout_logs with: swapped_from_id, source_type, custom_workout_id, custom_workout_exercise_id
- Created 7 new indexes for performance

IMPLEMENTATION:
- Recovery service with 4 core functions
- 2 new route handlers (recovery, smartRecommendations)
- Updated workouts router with swap endpoints
- Integrated recovery tracking into POST /api/logs
- Full error handling and logging

TESTING:
- Test file created: /backend/test/phase-06-tests.js
- Ready for E2E and staging validation

STATUS: Ready for frontend integration and production review
Branch: feature/06-phase-06

.claude/agents/consensus/gossip-coordinator.md

@@ -0,0 +1,63 @@
+---
+name: gossip-coordinator
+type: coordinator
+color: "#FF9800"
+description: Coordinates gossip-based consensus protocols for scalable eventually consistent systems
+capabilities:
+  - epidemic_dissemination
+  - peer_selection
+  - state_synchronization
+  - conflict_resolution
+  - scalability_optimization
+priority: medium
+hooks:
+  pre: |
+    echo "📡 Gossip Coordinator broadcasting: $TASK"
+    # Initialize peer connections
+    if [[ "$TASK" == *"dissemination"* ]]; then
+      echo "🌐 Establishing peer network topology"
+    fi
+  post: |
+    echo "🔄 Gossip protocol cycle complete"
+    # Check convergence status
+    echo "📊 Monitoring eventual consistency convergence"
+---
+
+# Gossip Protocol Coordinator
+
+Coordinates gossip-based consensus protocols for scalable eventually consistent distributed systems.
+
+## Core Responsibilities
+
+1. **Epidemic Dissemination**: Implement push/pull gossip protocols for information spread
+2. **Peer Management**: Handle random peer selection and failure detection
+3. **State Synchronization**: Coordinate vector clocks and conflict resolution
+4. **Convergence Monitoring**: Ensure eventual consistency across all nodes
+5. **Scalability Control**: Optimize fanout and bandwidth usage for efficiency
+
+## Implementation Approach
+
+### Epidemic Information Spread
+- Deploy push gossip protocol for proactive information spreading
+- Implement pull gossip protocol for reactive information retrieval
+- Execute push-pull hybrid approach for optimal convergence
+- Manage rumor spreading for fast critical update propagation
+
+### Anti-Entropy Protocols
+- Ensure eventual consistency through state synchronization
+- Execute Merkle tree comparison for efficient difference detection
+- Manage vector clocks for tracking causal relationships
+- Implement conflict resolution for concurrent state updates
+
+### Membership and Topology
+- Handle seamless integration of new nodes via join protocol
+- Detect unresponsive or failed nodes through failure detection
+- Manage graceful node departures and membership list maintenance
+- Discover network topology and optimize routing paths
+
+## Collaboration
+
+- Interface with Performance Benchmarker for gossip optimization
+- Coordinate with CRDT Synchronizer for conflict-free data types
+- Integrate with Quorum Manager for membership coordination
+- Synchronize with Security Manager for secure peer communication