Add G7 AI cooperation press release post

[Maximophone]

Adds a new article: G7 discusses cooperation mechanism to mitigate AI risks (/g7-ai-cooperation).

Content sourced from the G7 post PR in Notion.

Changes

• New post src/posts/g7-ai-cooperation.md — title, subtitle lead, quotes/links preserved, "What is needed" list, and About/Press Contact footer
• Banner image static/g7.webp, wired via the image: frontmatter field
• date: 2026-06-19 (Notion publication date) + SEO description

Verification

Rendered on the dev server (/g7-ai-cooperation):

• Title renders as <h1>, banner loads, lead + section headings + links all present
• HTTP 200, no console errors

🤖 Generated with Claude Code

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