feat(lab-03): complete Phase 4 - Compute & EC2 lab

Phase Plans (5 files):
- 04-RESEARCH.md: Domain research on Docker limits, healthchecks, EC2 parallels
- 04-VALIDATION.md: Success criteria and validation strategy
- 04-01-PLAN.md: Test infrastructure (RED phase)
- 04-02-PLAN.md: Diátxis documentation
- 04-03-PLAN.md: Infrastructure implementation (GREEN phase)

Test Scripts (6 files, 1300+ lines):
- 01-resource-limits-test.sh: Validate INF-03 compliance
- 02-healthcheck-test.sh: Validate healthcheck configuration
- 03-enforcement-test.sh: Verify resource limits with docker stats
- 04-verify-infrastructure.sh: Infrastructure verification
- 99-final-verification.sh: End-to-end student verification
- run-all-tests.sh: Test orchestration with fail-fast
- quick-test.sh: Fast validation (<30s)

Documentation (11 files, 2500+ lines):
Tutorials (3):
- 01-set-resource-limits.md: EC2 instance types, Docker limits syntax
- 02-implement-healthchecks.md: ELB health check parallels
- 03-dependencies-with-health.md: depends_on with service_healthy

How-to Guides (4):
- check-resource-usage.md: docker stats monitoring
- test-limits-enforcement.md: Stress testing CPU/memory
- custom-healthcheck.md: HTTP, TCP, database healthchecks
- instance-type-mapping.md: Docker limits → EC2 mapping

Reference (3):
- compose-resources-syntax.md: Complete deploy.resources reference
- healthcheck-syntax.md: All healthcheck parameters
- ec2-instance-mapping.md: Instance type mapping table

Explanation (1):
- compute-ec2-parallels.md: Container=EC2, Limits=Instance Type, Healthcheck=ELB

Infrastructure:
- docker-compose.yml: 5 services (web, app, worker, db, stress-test)
  All services: INF-03 compliant (cpus + memory limits)
  All services: healthcheck configured
  EC2 parallels: t2.nano, t2.micro, t2.small, t2.medium, m5.large
- Dockerfile: Alpine 3.19 + stress tools + non-root user

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

labs/lab-03-compute/tests/quick-test.sh

@@ -0,0 +1,79 @@
+#!/bin/bash
+# Quick Test - Lab 03: Compute & EC2
+# Fast validation for development (< 30 seconds)
+# Usage: bash labs/lab-03-compute/tests/quick-test.sh
+
+set -euo pipefail
+
+# Color definitions
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+BLUE='\033[0;34m'
+YELLOW='\033[1;33m'
+BOLD='\033[1m'
+NC='\033[0m'
+
+# Get script directory
+TEST_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+LAB_DIR="$(cd "$TEST_DIR/.." && pwd)"
+
+# Quick checks (no verbose output)
+echo -e "${BLUE}Quick Test - Lab 03: Compute & EC2${NC}\n"
+
+# Check 1: File exists
+if [[ ! -f "$LAB_DIR/docker-compose.yml" ]]; then
+    echo -e "${RED}✗ docker-compose.yml not found${NC}"
+    exit 1
+fi
+echo -e "${GREEN}✓${NC} docker-compose.yml exists"
+
+# Check 2: Syntax valid
+if ! docker compose config &> /dev/null; then
+    echo -e "${RED}✗ docker-compose.yml syntax error${NC}"
+    exit 1
+fi
+echo -e "${GREEN}✓${NC} Syntax valid"
+
+# Check 3: Services defined
+SERVICES=$(docker compose config --services 2>/dev/null)
+SERVICE_COUNT=$(echo "$SERVICES" | wc -l)
+if [[ $SERVICE_COUNT -lt 3 ]]; then
+    echo -e "${RED}✗ Only $SERVICE_COUNT services (need 3+)${NC}"
+    exit 1
+fi
+echo -e "${GREEN}✓${NC} $SERVICE_COUNT services defined"
+
+# Check 4: Resource limits (INF-03)
+NON_COMPLIANT=0
+for service in $SERVICES; do
+    has_cpu=$(docker compose config 2>/dev/null | grep -A 30 "^$service:" | grep -c "cpus:" || echo "0")
+    has_mem=$(docker compose config 2>/dev/null | grep -A 30 "^$service:" | grep -c "memory:" || echo "0")
+    if [[ $has_cpu -eq 0 || $has_mem -eq 0 ]]; then
+        ((NON_COMPLIANT++)) || true
+    fi
+done
+if [[ $NON_COMPLIANT -gt 0 ]]; then
+    echo -e "${RED}✗ $NON_COMPLIANT services missing resource limits (INF-03)${NC}"
+    exit 1
+fi
+echo -e "${GREEN}✓${NC} INF-03 compliant (all services have limits)"
+
+# Check 5: Healthchecks
+MISSING_HC=0
+for service in $SERVICES; do
+    has_hc=$(docker compose config 2>/dev/null | grep -A 50 "^$service:" | grep -c "healthcheck:" || echo "0")
+    if [[ $has_hc -eq 0 ]]; then
+        ((MISSING_HC++)) || true
+    fi
+done
+if [[ $MISSING_HC -gt 0 ]]; then
+    echo -e "${YELLOW}⚠ $MISSING_HC services missing healthchecks${NC}"
+else
+    echo -e "${GREEN}✓${NC} All services have healthchecks"
+fi
+
+# Summary
+echo -e "\n${GREEN}${BOLD}✓ Quick test PASSED${NC}\n"
+echo -e "For full verification, run:"
+echo -e "  bash tests/run-all-tests.sh"
+echo -e "  bash tests/99-final-verification.sh"