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/quick-start.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+# Quick start guide for Claude Flow
+
+echo "🚀 Claude Flow Quick Start"
+echo "=========================="
+echo ""
+echo "1. Initialize a swarm:"
+echo "   npx claude-flow swarm init --topology hierarchical"
+echo ""
+echo "2. Spawn agents:"
+echo "   npx claude-flow agent spawn --type coder --name "API Developer""
+echo ""
+echo "3. Orchestrate tasks:"
+echo "   npx claude-flow task orchestrate --task "Build REST API""
+echo ""
+echo "4. Monitor progress:"
+echo "   npx claude-flow swarm monitor"
+echo ""
+echo "📚 For more examples, see .claude/commands/"