Retain codeanalyzer as a deprecated alias for canpy #40

A hand-maintained option list drifts from the implementation. Generate the
canpy --help block deterministically from the live CLI between marker comments,
and synchronize it at release time.

Scope:

• scripts/update_readme.py: render help (fixed width, no color) between markers; --check mode reports staleness
• release.yml: regenerate the README block and schema.neo4j.json, commit back to main before publishing