Add Claude usage report with message breakdown and token usage details

Author: marcarl

reports/claude-usage.md

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+# Claude usage
+
+💬 Message Breakdown:
+    👤 Human: 358 (6.4%)
+    ⚙️ Agent: 2531 (45.5%)
+    🤖 Assistant: 2673 (48.1%)
+    📊 Total: 5562 messages
+
+🔤 Input tokens: 106,570
+    💭 Output tokens: 183,741
+    💾 Cache creation tokens: 11,453,781
+    ⚡ Cache read tokens: 183,402,430
+
+🤖 Usage & Cost by Model:
+
+    ● claude-sonnet-4-20250514:
+         📊 Messages: 2,181
+         📥 Input: 95,005 tokens
+         📤 Output: 140,601 tokens
+         💾 Cache write: 9,333,157 tokens
+         ⚡ Cache read: 160,457,245 tokens
+         🎯 Total: 170,026,008 tokens
+         💰 Cost: $85.5305
+ 
+    ● claude-opus-4-20250514:
+         📊 Messages: 486
+         📥 Input: 11,565 tokens
+         📤 Output: 43,140 tokens
+         💾 Cache write: 2,120,624 tokens
+         ⚡ Cache read: 22,945,185 tokens
+         🎯 Total: 25,120,514 tokens
+         💰 Cost: $77.5885
+
+══════════════════════════════════════════════════
+
+ 💵 Total Cost: $163.1190