feat: initial Claude Code configuration scaffold

Comprehensive Claude Code guidance system with:

- 5 agents: tdd-guardian, code-reviewer, security-scanner, refactor-scan, dependency-audit
- 18 skills covering languages (Python, TypeScript, Rust, Go, Java, C#),
  infrastructure (AWS, Azure, GCP, Terraform, Ansible, Docker/K8s, Database, CI/CD),
  testing (TDD, UI, Browser), and patterns (Monorepo, API Design, Observability)
- 3 hooks: secret detection, auto-formatting, TDD git pre-commit
- Strict TDD enforcement with 80%+ coverage requirements
- Multi-model strategy: Opus for planning, Sonnet for execution (opusplan)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.claude/hooks/example-git-hooks/pre-commit

@@ -0,0 +1,14 @@
+#!/bin/bash
+# Git pre-commit hook for TDD enforcement
+#
+# Installation:
+#   cp ~/.claude/hooks/example-git-hooks/pre-commit .git/hooks/pre-commit
+#   chmod +x .git/hooks/pre-commit
+#
+# Or create a symlink:
+#   ln -sf ~/.claude/hooks/example-git-hooks/pre-commit .git/hooks/pre-commit
+
+# Source the TDD enforcement script
+~/.claude/hooks/pre-commit-tdd.sh
+
+exit $?