Comment Cleanup

Remove low-value prose from source files and READMEs without changing behaviour. Three patterns are in scope; everything else is left alone. The output is a comment-only diff.

The three patterns

Apply one test to every comment: does it tell a reader something they cannot get from the code within a few lines of it? If yes, keep it (shortened if needed). If no, delete it.

Pattern 1 - Comment restates the adjacent code

The content is inferable from the few lines above and below. Delete it.

# Get the content text from the message
content_text = message.get_content_text()