openai/gpt-chat-latest → A (50:1)

Commit A introduces a substantial new URL canonicalization subsystem: a semantic graph with traversal logic, a graph builder with validation, URL parsing and normalization, generic fallback behavior, breadcrumb generation, support for Reddit and YouTube URL patterns, and an extensive test suite covering parsing, canonicalization, traversal, security-related encoding, and regressions. It adds multiple new modules and hundreds of lines of functionality. Commit B is a small UI cleanup that removes a preview section from the HTML output. While potentially useful, it is a minor deletion compared with the broad architectural feature and test coverage added in Commit A.