🔧 Fix index links: Use correct _filename field from consolidated data

- Fixed generate_index_from_consolidated.py to use '_filename' instead of 'filename'
- Links now correctly include date suffixes (e.g., _270525.json)
- All 892 index entries now have valid GitHub links
- Updated index.md and README.md with correct links

Example fix:
❌ system-prompts/json/1-StarReviewExplorer.json
✅ system-prompts/json/1-StarReviewExplorer_270525.json

Author: danielrosehill

README.md

@@ -1,6 +1,6 @@
 {
   "metadata": {
-    "generated_at": "2025-08-03T19:43:53.614872",
+    "generated_at": "2025-08-03T19:47:28.976570",
     "total_prompts": 944,
     "source_directory": "../system-prompts/json",
     "files_processed": 944,

consolidated_prompts.json

@@ -945,6 +945,6 @@
     "SRPBreakdownUtility_170725.json": "4bc1b058a20064e451b2e5e498dde176",
     "SocialMediaQuoteTemplater_280725.json": "3fc729f39fb25f01630888a4e19d078d"
   },
-  "last_update": "2025-08-03T19:43:53.614860",
+  "last_update": "2025-08-03T19:47:28.976559",
   "total_files": 944
 }

consolidated_prompts.metadata.json

@@ -3,7 +3,7 @@
     {
       "date": "2025-08-03",
       "count": 892,
-      "updated": "2025-08-03T19:43:53.702802"
+      "updated": "2025-08-03T19:47:29.042770"
     }
   ]
 }