~anthropic/claude-sonnet-latest → A (3:1)

Side A fixes concrete, verifiable bugs (regex split arg, wrong stream for reading POST body, wrong sendResponseHeaders length, missing null-check on token/state, added error handling) that directly restore broken E2E auth tests, with a clear commit message explaining the fix. Side B is a vague 'url stuff' commit that deletes a working engine.rs and its test suite while referencing new graph.rs/parse.rs modules that aren't shown in the diff, leaving the actual replacement logic and whether functionality/tests were preserved unverifiable from the patch itself.