feat: update author weekly update

[dewabisma]

Summary

Properly attribute author in weekly update.

[n13]

Reviewer model: GPT Sol

APPROVE — Weekly-update entries now resolve to Christopher Smith unless an explicit author is set, and the resolved identity is consistently used for the visible byline, Article JSON-LD, and Twitter creator metadata.

No blocking findings.

Validation:

• Reviewed the complete 704c1ad...e620bb3 diff and affected collection/rendering paths.
• git diff --check passed.
• Frozen Bun dependency installation passed with browser download disabled for the local environment.
• bun run check:seo-meta passed, and 6 focused resolver cases passed.
• Astro generated every localized route and optimized assets; rendered weekly pages contain Christopher Smith, /team/christopher-smith, and twitter:creator=@YuviLightman. Compression completed for 1,406 HTML files, although the local command was stopped after the integration did not exit promptly.
• GitHub Actions reported startup_failure before creating any jobs or logs, so no remote checks ran.

Non-blocking follow-up: src/content.config.ts is the only changed file rejected by Prettier (its base version passes); running Prettier on that file would keep the patch consistent. The repository-wide format check also reports 15 unrelated pre-existing files.