fix: use portable ERE sed pattern for normalizing memory addresses in models.yaml

The previous BRE pattern used `\+` (GNU sed extension) which silently fails
on macOS BSD sed. Switch to `-E` (extended regex) with POSIX character class
`[^[:space:]]` instead of `\S` (also unsupported by BSD sed), making the
normalization work on both macOS and Linux.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: candleindark