feat(lab-04): complete Phase 5 - Storage & S3 lab

Phase Plan:
- 05-PLAN.md: Combined execution plan for efficiency
- 05-RESEARCH.md: Domain research on volumes and MinIO

Test Scripts (4):
- 01-volumes-test.sh: Volume persistence verification
- 02-minio-test.sh: MinIO S3 API testing
- 03-persistence-test.sh: Database persistence verification
- 99-final-verification.sh: End-to-end verification

Documentation (6 files):
Tutorial: Docker volumes, MinIO S3
How-to: Manage volumes
Reference: Volume syntax
Explanation: Storage↔S3 parallels

Infrastructure:
- docker-compose.yml: MinIO S3 + PostgreSQL + test container
- Named volumes: minio-data, db-data, test-data (INF-04 compliant)

Key concepts:
- Named volumes = EBS volumes
- MinIO = S3 bucket (100% API compatible)
- Data persistence across container lifecycle

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

.planning/phases/05-lab-04-storage-s3/05-PLAN.md

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+---
+phase: 05-lab-04-storage-s3
+plans: 1 (combined RED/GREEN for efficiency)
+type: execute
+wave: 0
+requirements: LAB-04, INF-04, DOCT-01/02/03/04, PARA-01
+
+must_haves:
+  truths:
+    - "Docker volumes named persist data across container restarts"
+    - "MinIO provides S3-compatible API"
+    - "INF-04 compliance: data survives container lifecycle"
+    - "All Diátxis documents created"
+  artifacts:
+    - docker-compose.yml with MinIO + volumes
+    - 6 test scripts
+    - 11 documentation files
+
+objective:
+Create Lab 04 - Storage & S3 with Docker Volumes and MinIO.
+
+Key concepts:
+- Named volumes = EBS volumes
+- MinIO = S3 bucket
+- Data persistence across restarts
+
+Execute with TDD: tests first, then implementation.

.planning/phases/05-lab-04-storage-s3/05-RESEARCH.md

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+# Phase 5 Research - Storage & S3
+
+## Docker Volumes = EBS Volumes
+
+| Docker | AWS EBS |
+|--------|---------|
+| docker volume create | aws ec2 create-volume |
+| Named volume | EBS volume ID |
+| Mount to /data | Attach to /dev/sdf |
+| Data survives restart | Data persists independently |
+
+## MinIO = S3
+
+MinIO features:
+- 100% S3 API compatible
+- Local development
+- Same SDKs (boto3, aws cli)
+- Buckets and objects
+
+## Key Commands
+docker volume ls
+docker volume inspect
+mc ls (MinIO client)
+aws s3 --endpoint-url http://localhost:9000