chore: preview YARD formatting fixes from gapic-generator-ruby #1337

[suztomo]

Summary

This draft PR previews code regeneration across libraries generated with the updated fixes in googleapis/gapic-generator-ruby#1337 (including excluding fenced code blocks and multiline inline code spans from brace escaping and doc tag sanitization, and adding attr, attr_reader, attr_writer).

Changes

• Escapes multi-line braces ((?<!\\)\{(?=[^\s]) -> \\{) outside backtick spans and fenced code blocks in proto docstrings.
• Preserves multiline inline code spans (`...`) and fenced code blocks (... and ~~~...~~~) without brace escaping or tag sanitization so code examples (like "divider": {}, @FooBot, and multiline resource name templates) are preserved verbatim.
• Sanitizes unknown doc tags ((?<=\A|\s)@tag outside backtick spans -> `@tag`) while preserving valid YARD tags (@attr, @attr_reader, @attr_writer, @overload, @param, etc.).

Verification

• Ran librarian generate --all with locally installed gapic-generator gem (0.51.1).
• Verified toys ci --yard --gems google-apps-chat-v1 passes with 0 warnings and 0 errors.
• Verified toys ci --yard --gems google-cloud-compute-v1 passes with 0 warnings and 0 errors.
• Verified toys ci --yard --gems google-cloud-ai_platform-v1 passes with 0 warnings and 0 errors.

Related:

• fix(generator): escape multi-line braces and backtick unknown doc tags in yard formatting gapic-generator-ruby#1337
• ruby: YARD documentation warning in google-cloud-compute librarian#7461
• ruby: google-cloud-compute-v1 librarian#7452

[suztomo]

All checks passed.

[aandreassa]

Is this needed?

[suztomo]

Working on this.

[suztomo]

Fixed.

[suztomo]

All checks have passed.