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/helpers/setup-mcp.sh

@@ -0,0 +1,18 @@
+#!/bin/bash
+# Setup MCP server for Claude Flow
+
+echo "🚀 Setting up Claude Flow MCP server..."
+
+# Check if claude command exists
+if ! command -v claude &> /dev/null; then
+    echo "❌ Error: Claude Code CLI not found"
+    echo "Please install Claude Code first"
+    exit 1
+fi
+
+# Add MCP server
+echo "📦 Adding Claude Flow MCP server..."
+claude mcp add claude-flow npx claude-flow mcp start
+
+echo "✅ MCP server setup complete!"
+echo "🎯 You can now use mcp__claude-flow__ tools in Claude Code"