Fix 30 KB errors: ExaCS storage 3-10x wrong, ECPU transition, IOPS limits, missing shapes

Cross-referenced all 70+ KB files against official Oracle docs. Critical fixes:
- ExaCS: storage was flash cache not usable disk (76.8→190.8 TB QR), added X11M, removed X10M
- ADB-S: OCPU→ECPU migration, 26ai as default, cross-region RTO 15→10 min
- Compute: E5 max 94→126, A2 80→78, added E6/A4/BM shapes, 11 GPU shapes
- Storage: Higher Perf IOPS 35K→50K, UHP 450K→300K, File Storage 25K→50K
- DBCS: E5.Flex max 94→64, storage 80→150 TB, added 26ai
- Networking: FastConnect +400 Gbps, NSG max 120 rules

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

kb/sizing/storage-performance.yaml

@@ -33,14 +33,14 @@ storage_tiers:
   block_volume_higher_performance:
     type: "Block Volume (Higher Performance)"
     iops_per_gb: 75
-    max_iops: 35000
+    max_iops: 50000
     throughput_kbps_per_gb: 600
-    max_throughput_mbps: 600
+    max_throughput_mbps: 680
     latency_us: "Sub-millisecond"
 
   block_volume_uhp:
     type: "Block Volume (Ultra High Performance)"
-    max_iops: 450000
+    max_iops: 300000
     max_throughput_mbps: 2680
     notes: "Requires UHP-enabled shapes"
 
@@ -53,7 +53,7 @@ storage_tiers:
 
   file_storage:
     type: "File Storage (NFS)"
-    max_iops: 25000
+    max_iops: 50000
     max_throughput_mbps: 1200
     latency: "Sub-millisecond"
     use_for: "Shared file access, NFS workloads"