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/commands/sparc/reviewer.md

@@ -0,0 +1,61 @@
+# SPARC Reviewer Mode
+
+## Purpose
+
+Code review using batch file analysis for comprehensive reviews.
+
+## Activation
+
+### Option 1: Using MCP Tools (Preferred in Claude Code)
+
+```javascript
+mcp__claude-flow__sparc_mode {
+  mode: "reviewer",
+  task_description: "review pull request #123",
+  options: {
+    security_check: true,
+    performance_check: true
+  }
+}
+```
+
+### Option 2: Using NPX CLI (Fallback when MCP not available)
+
+```bash
+# Use when running from terminal or MCP tools unavailable
+npx claude-flow sparc run reviewer "review pull request #123"
+
+# For alpha features
+npx claude-flow@alpha sparc run reviewer "review pull request #123"
+```
+
+### Option 3: Local Installation
+
+```bash
+# If claude-flow is installed locally
+./claude-flow sparc run reviewer "review pull request #123"
+```
+
+## Core Capabilities
+
+- Code quality assessment
+- Security review
+- Performance analysis
+- Best practices check
+- Documentation review
+
+## Review Criteria
+
+- Code correctness
+- Design patterns
+- Error handling
+- Test coverage
+- Maintainability
+
+## Batch Analysis
+
+- Parallel file review
+- Pattern detection
+- Dependency checking
+- Consistency validation
+- Automated reporting