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/auto-format.sh

@@ -0,0 +1,54 @@
+#!/bin/bash
+# Auto-format files after writing
+# Runs appropriate formatter based on file extension
+
+set -e
+
+# Read the file path from stdin
+INPUT=$(cat)
+FILE_PATH=$(echo "$INPUT" | jq -r '.file_path // .filePath // empty')
+
+if [ -z "$FILE_PATH" ] || [ ! -f "$FILE_PATH" ]; then
+    exit 0
+fi
+
+# Get file extension
+EXT="${FILE_PATH##*.}"
+
+case "$EXT" in
+    py)
+        if command -v ruff &> /dev/null; then
+            ruff format "$FILE_PATH" 2>/dev/null || true
+            ruff check --fix "$FILE_PATH" 2>/dev/null || true
+        fi
+        ;;
+    ts|tsx|js|jsx)
+        # Try to find and use project's ESLint config
+        DIR=$(dirname "$FILE_PATH")
+        while [ "$DIR" != "/" ]; do
+            if [ -f "$DIR/package.json" ]; then
+                cd "$DIR"
+                if [ -f "node_modules/.bin/eslint" ]; then
+                    ./node_modules/.bin/eslint --fix "$FILE_PATH" 2>/dev/null || true
+                fi
+                break
+            fi
+            DIR=$(dirname "$DIR")
+        done
+        ;;
+    rs)
+        if command -v rustfmt &> /dev/null; then
+            rustfmt "$FILE_PATH" 2>/dev/null || true
+        fi
+        ;;
+    tf)
+        if command -v terraform &> /dev/null; then
+            terraform fmt "$FILE_PATH" 2>/dev/null || true
+        fi
+        ;;
+    yaml|yml)
+        # Skip YAML formatting to preserve structure
+        ;;
+esac
+
+exit 0