Remove redundant `node_modules/` entries from sub-directory .gitignore
files. The root `.gitignore` already has `**/node_modules/` which covers
all nested directories, making these per-package entries unnecessary.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Add trailing slash to node_modules entries in sub-package .gitignore
files so they match only directories, not files named node_modules.
The root .gitignore already uses **/node_modules/ (fixed in #203);
these per-package entries were also missing the slash.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>