fix: filter non-integer metadata from GitHub languages API response (#322)

PyGithub's get_languages() returns raw API JSON which in some environments
includes non-integer metadata keys (e.g., "url"), causing a TypeError in
sum(). Now filters to integer values only before calculating percentages.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/skill_seekers/cli/github_scraper.py

@@ -519,6 +519,13 @@ class GitHubScraper:
 
         try:
             languages = self.repo.get_languages()
+            # Filter out non-integer metadata (e.g., "url" key from some API configurations)
+            non_lang_keys = {k for k, v in languages.items() if not isinstance(v, int)}
+            if non_lang_keys:
+                logger.debug(
+                    f"Filtered non-language keys from API response: {non_lang_keys}"
+                )
+                languages = {k: v for k, v in languages.items() if isinstance(v, int)}
             total_bytes = sum(languages.values())
 
             self.extracted_data["languages"] = {