Upgrade Astro v5 → v7

[HumbleBee14]

Upgrades the project two majors: Astro 5.18 → 7.1.1. Done while the site has zero posts — the cheapest possible migration window.

Changes

• v6 content collections: moved `src/content/config.ts` → `src/content.config.ts` and fixed the topic-scan `readdirSync` path (relative base changed with the file location). All collections already used the modern glob loader, so no loader rewrites needed.
• Zod v4: import `z` directly from `zod` (the `astro:content` re-export is deprecated); migrated `z.string().url()`/`.email()` → top-level `z.url()`/`z.email()`. Cleared 64 deprecation hints.
• v7 MDX plugin API: moved `remarkPlugins`/`rehypePlugins` off `mdx({...})` (deprecated, removed in v8) onto a shared `markdown.processor` via `unified()`. MDX inherits them.
• Deps: astro 7.1.1, @astrojs/mdx 7, @astrojs/react 6, sitemap/rss/check bumped; added `zod` as a direct dependency.

Verification

• `npm run verify`: 0 errors, 0 warnings, 2 hints (both pre-existing, unrelated)
• `npm run build`: succeeds, Pagefind indexes
• 69/69 tests pass
• KaTeX math + autolink heading anchors verified rendering after the processor move
• Dev server: /, /blog, /write (React island), /forum all return 200

External deps unaffected by the version jump: Pagefind, giscus, forum GraphQL, Cloudflare Pages Functions, write portal (BlockNote).

🤖 Generated with Claude Code

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Deploying mlsystems with    Cloudflare Pages

Latest commit:	5a33303
Status:	⚡️  Build in progress...

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