Renamed sample log input and expected output files in testdata to use a consistent 'log-*-input.txt' and 'log-*-want.txt' naming scheme. Updated references in log_test.go to match the new file names for improved clarity and maintainability.
A comment was added to TestFollow with instructions on how to update the .want testdata files when test outputs change. This helps maintainers regenerate expected output files more easily.
Updated the LogRenderer interface and implementations to accept *iostreams.IOStreams instead of *iostreams.ColorScheme, enabling access to terminal theme and width for improved markdown rendering. Refactored related code, tests, and mocks to support this change, and enhanced log rendering to better handle markdown and code output for various tool calls.
