fix: unify scraper argument interface and fix create command forwarding

All scrapers (scrape, github, analyze, pdf) now share a common argument
contract via add_all_standard_arguments() in arguments/common.py.
Universal flags (--dry-run, --verbose, --quiet, --name, --description,
workflow args) work consistently across all source types.

Previously, `create <url> --dry-run`, `create owner/repo --dry-run`,
and `create ./path --dry-run` would crash because sub-scrapers didn't
accept those flags. Also fixes main.py _handle_analyze_command() not
forwarding --dry-run, --preset, --quiet, --name, --description to
codebase_scraper.

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

src/skill_seekers/cli/pdf_scraper.py

@@ -13,6 +13,7 @@ Usage:
 
 import argparse
 import json
+import logging
 import os
 import re
 import sys
@@ -644,6 +645,24 @@ def main():
 
     args = parser.parse_args()
 
+    # Set logging level from behavior args
+    if getattr(args, "quiet", False):
+        logging.getLogger().setLevel(logging.WARNING)
+    elif getattr(args, "verbose", False):
+        logging.getLogger().setLevel(logging.DEBUG)
+
+    # Handle --dry-run
+    if getattr(args, "dry_run", False):
+        source = args.pdf or args.config or args.from_json or "(none)"
+        print(f"\n{'=' * 60}")
+        print(f"DRY RUN: PDF Extraction")
+        print(f"{'=' * 60}")
+        print(f"Source:         {source}")
+        print(f"Name:           {getattr(args, 'name', None) or '(auto-detect)'}")
+        print(f"Enhance level:  {getattr(args, 'enhance_level', 0)}")
+        print(f"\n✅ Dry run complete")
+        return
+
     # Validate inputs
     if not (args.config or args.pdf or args.from_json):
         parser.error("Must specify --config, --pdf, or --from-json")