Serve /quickstart.md as plain markdown

[isuttell]

Summary

GET /quickstart.md now returns the same markdown as the rendered /quickstart page. That honors the "append .md to any page" promise on the first page published READMEs send agents to.

Changes

• Worker negotiator serves any known .md URL as text/markdown without an Accept hint.
• Path lookup strips .md, so /quickstart.md === /quickstart === quickstartMarkdown().
• Dedicated /quickstart.md route matches the existing docs .md file-route pattern.
• llms.txt lists https://splitch.dev/quickstart.md.
• No quickstart copy change. No SDK docs refresh.

Top-level route sweep

Sitemap HTML pages that are not under /docs:

Page	.md variant	Result
/	/.md	already served via llms.txt / Accept; suffix now resolves
/quickstart	/quickstart.md	200 text/markdown; charset=utf-8, same body as HTML source

Non-HTML top-level routes left alone: /health, /llms.txt, /robots.txt, /sitemap.xml, /.well-known/api-catalog.

Pinned by markdown-route.test.ts against staticPagePaths from the sitemap (["/", "/quickstart"]) and by negotiate-markdown.test.ts for GET/HEAD /quickstart.md with no Accept header.

Risk: LOW

• Areas touched: apps/marketing public markdown routing
• Security: public content only
• Performance: suffix check on GET/HEAD
• Breaking: none; previously 404, now 200

Test plan / evidence

• pnpm --filter @splitch/marketing exec vitest run src/docs/markdown-route.test.ts src/docs/negotiate-markdown.test.ts src/docs/sitemap.test.ts — 16 passed at 17:32 UTC
• Lefthook verify:commit green on 504915b4
• Lefthook verify:push green on push of 504915b4
• Hosted Verify green on current head 504915b4: https://github.com/zaks-io/splitch/actions/runs/35129107857/job/104905370841
• Prior hosted Verify green on implementation head dbcde6d3: https://github.com/zaks-io/splitch/actions/runs/35128267788/job/104902606820
• Author QA (ziw-code-review) READY FOR PR on dbcde6d3 (implementation). Follow-up 504915b4 is the sitemap sweep pin only. Author QA is not independent review evidence.

Head: 504915b4d2f9643b4fe3ac55f39d4e96b9c59b9d
Base / merge-base: 4ccab72d81e751e60ee3e9a8cc6f7fc3e1b68643 (origin/main)

Issue: SPL-401

Linear Issue: SPL-401

  

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