Merge study-tracker into repo + update exam goal to July 7

- Updated README with combined navigation and exam details
- Updated SCHEDULE.md exam goal from June 30 to July 7, 2026
- Added certifications/roadmap.md with full cert path (A+ → CCNA → AWS → CKA)
- Added certifications/a-plus-core2.md with exam details, domain breakdown,
  practice test log, weak areas, and homelab experience map

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

certifications/roadmap.md

@@ -0,0 +1,22 @@
+# Certification Roadmap
+
+**Career goal:** Cloud Engineering
+**Current level:** CompTIA A+ Core 1 passed (highest score in class of 22)
+
+## Path
+
+| # | Cert | Status | Target | Notes |
+|---|------|--------|--------|-------|
+| 1 | CompTIA A+ Core 1 | ✅ PASSED | — | Highest score in class of 22 |
+| 2 | CompTIA A+ Core 2 | 🔄 Studying | July 7, 2026 (goal) / July 12 (hard deadline) | Diagnostic: 50% Sybex cold |
+| 3 | CCNA | 📅 Next | ~2026 Q4 | Gold standard networking cert |
+| 4 | AWS SAA-C03 | 📅 Planned | After CCNA | Core cloud cert, most in-demand |
+| 5 | AWS SysOps Associate | 📅 Planned | After SAA | Operations focus, maps to homelab |
+| 6 | CKA (Kubernetes) | 📅 Planned | After AWS | Container orchestration at scale |
+| 7 | AI / Prompt Engineering | 📅 Planned | After cloud foundation | AWS AI Practitioner, DeepLearning.AI |
+
+## Why This Order
+
+- Networking (CCNA) before cloud makes AWS 3x easier to understand
+- Associate certs before specialties — breadth before depth
+- Homelab project (KiteStacks) already demonstrates cloud engineering skills at associate level