feat(site): add canonical sitemap generation

[chaliy]

What

Add canonical sitemap generation for bashkit.sh. The site now builds /sitemap.xml, adds <lastmod> entries, removes Astro's intermediate sitemap files, and points robots.txt at the canonical sitemap.

Why

The site advertised a sitemap URL but did not generate one. Crawlers should have a single canonical /sitemap.xml target.

How

• Add @astrojs/sitemap to the Astro site
• Add a post-build sitemap enhancer modeled after the Everruns docs app
• Add a post-build verifier that checks all generated HTML routes and rejects sitemap-index.xml
• Run deploy through npm run build so verification executes before Wrangler deploys

Risk

• Low
• Site build could fail if Astro changes sitemap output naming; verifier catches that before deploy.

Checklist

• Tests added or updated
• Backward compatibility considered

Verified:

• npm run build
• npm run check
• just pre-pr

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	bashkit	b73ad48	Commit Preview URL Branch Preview URL	Apr 29 2026, 10:23 PM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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