fix: Complete fix for Issue #219 - All three problems resolved

**Problem #1: Large File Encoding Error** ✅ FIXED
- Add large file download support via download_url
- Detect encoding='none' for files >1MB
- Download via GitHub raw URL instead of API
- Handles ccxt/ccxt's 1.4MB CHANGELOG.md successfully

**Problem #2: Missing CLI Enhancement Flags** ✅ FIXED
- Add --enhance, --enhance-local, --api-key to main.py github_parser
- Add flag forwarding in CLI dispatcher
- Fixes 'unrecognized arguments' error
- Users can now use: skill-seekers github --repo owner/repo --enhance-local

**Problem #3: Custom API Endpoint Support** ✅ FIXED
- Support ANTHROPIC_BASE_URL environment variable
- Support ANTHROPIC_AUTH_TOKEN (alternative to ANTHROPIC_API_KEY)
- Fix ThinkingBlock.text error with newer Anthropic SDK
- Find TextBlock in response content array (handles thinking blocks)

**Changes**:
- src/skill_seekers/cli/enhance_skill.py:
  - Support custom base_url parameter
  - Support both ANTHROPIC_API_KEY and ANTHROPIC_AUTH_TOKEN
  - Iterate through content blocks to find text (handles ThinkingBlock)

- src/skill_seekers/cli/main.py:
  - Add --enhance, --enhance-local, --api-key to github_parser
  - Forward flags to github_scraper.py in dispatcher

- src/skill_seekers/cli/github_scraper.py:
  - Add large file detection (encoding=None/"none")
  - Download via download_url with requests
  - Log file size and download progress

- tests/test_github_scraper.py:
  - Add test_get_file_content_large_file
  - Add test_extract_changelog_large_file
  - All 31 tests passing ✅

**Credits**:
- Thanks to @XGCoder for detailed bug report
- Thanks to @gorquan for local fixes and guidance

Fixes #219

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

src/skill_seekers/cli/main.py

@@ -99,6 +99,9 @@ For more information: https://github.com/yusufkaraaslan/Skill_Seekers
     github_parser.add_argument("--repo", help="GitHub repo (owner/repo)")
     github_parser.add_argument("--name", help="Skill name")
     github_parser.add_argument("--description", help="Skill description")
+    github_parser.add_argument("--enhance", action="store_true", help="AI enhancement (API)")
+    github_parser.add_argument("--enhance-local", action="store_true", help="AI enhancement (local)")
+    github_parser.add_argument("--api-key", type=str, help="Anthropic API key for --enhance")
 
     # === pdf subcommand ===
     pdf_parser = subparsers.add_parser(
@@ -274,6 +277,12 @@ def main(argv: Optional[List[str]] = None) -> int:
                 sys.argv.extend(["--name", args.name])
             if args.description:
                 sys.argv.extend(["--description", args.description])
+            if args.enhance:
+                sys.argv.append("--enhance")
+            if args.enhance_local:
+                sys.argv.append("--enhance-local")
+            if args.api_key:
+                sys.argv.extend(["--api-key", args.api_key])
             return github_main() or 0
 
         elif args.command == "pdf":