Add --debug flag for verbose logging

- Add LAST30DAYS_DEBUG env var / --debug flag
- Log HTTP requests, responses, and errors
- Show API error details when debug enabled
- Helps diagnose API failures

Usage: python3 last30days.py "topic" --debug

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

scripts/last30days.py

@@ -11,10 +11,12 @@ Options:
     --sources=MODE      Source selection: auto|reddit|x|both (default: auto)
     --quick             Faster research with fewer sources (8-12 each)
     --deep              Comprehensive research with more sources (50-70 Reddit, 40-60 X)
+    --debug             Enable verbose debug logging
 """
 
 import argparse
 import json
+import os
 import sys
 from datetime import datetime, timezone
 from pathlib import Path
@@ -190,9 +192,21 @@ def main():
         action="store_true",
         help="Comprehensive research with more sources (50-70 Reddit, 40-60 X)",
     )
+    parser.add_argument(
+        "--debug",
+        action="store_true",
+        help="Enable verbose debug logging",
+    )
 
     args = parser.parse_args()
 
+    # Enable debug logging if requested
+    if args.debug:
+        os.environ["LAST30DAYS_DEBUG"] = "1"
+        # Re-import http to pick up debug flag
+        from lib import http as http_module
+        http_module.DEBUG = True
+
     # Determine depth
     if args.quick and args.deep:
         print("Error: Cannot use both --quick and --deep", file=sys.stderr)