chore: restore .claude commands, agents, helpers & skills (lost in 1df208d)

Restores the entire .claude/ infrastructure that was accidentally deleted
in commit 1df208d ('feat(timeline): add pulse animation for in-flight drag
mutations'). Recovered via git checkout 1df208d^.

Restored:
- .claude/commands/ (gitlooper, sparc/, github/, automation/, monitoring/,
  optimization/, hooks/, plan, implement, research, review, perf, visualaudit)
- .claude/agents/ (core/, github/, sparc/, v3/, swarm/, templates/, ...)
- .claude/helpers/ (41 scripts incl. hook-handler.cjs, statusline.cjs)
- .claude/skills/ (20 skills incl. sparc-methodology, github-*, v3-*)
- .claude/settings.json (hooks configuration)

Also updated all CapaKraken → Nexus references in affected command files.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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

@@ -0,0 +1,66 @@
+---
+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