docs: add prompt library page for Walrus skills

[reemsabawi-mystenlabs]

Description

Describe the changes or additions included in this PR.

Test plan

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Release notes

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[github-actions]

PR Preview Action v1.8.1
🚀 View preview at https://MystenLabs.github.io/walrus/pr-preview/pr-3534/
Built to branch gh-pages at 2026-07-09 23:04 UTC. Preview will be ready when the GitHub Pages deployment is complete.

[github-actions]

📋 afdocs check results

URL: https://MystenLabs.github.io/walrus/pr-preview/pr-3534/

Running checks on mystenlabs.github.io/walrus/pr-preview/pr-3534/...

Agent-Friendly Docs Check: https://MystenLabs.github.io/walrus/pr-preview/pr-3534/
Timestamp: 7/9/2026, 11:07:56 PM

content-discoverability
  ✓ llms-txt-exists: llms.txt found at https://MystenLabs.github.io/walrus/pr-preview/pr-3534/llms.txt
  ✓ llms-txt-valid: llms.txt follows the proposed structure (H1, blockquote, heading-delimited link sections)
  ⚠ llms-txt-size: llms.txt is 58,673 characters (between 50,000 and 100,000; consider splitting)
      Learn more: https://agentdocsspec.com/spec/#llms-txt-size
  ○ llms-txt-links-resolve: llms.txt contains 170 links, but none are under /walrus/pr-preview/pr-3534
  ○ llms-txt-links-markdown: llms.txt contains 170 links, but none are under /walrus/pr-preview/pr-3534
  ✓ llms-txt-directive-html: llms.txt directive found in HTML of all 170 pages, near the top of content
  ✗ llms-txt-directive-md: Could not fetch markdown for any of 170 pages; 170 had no markdown version
      Learn more: https://agentdocsspec.com/spec/#llms-txt-directive-md

markdown-availability
  ✗ markdown-url-support: No pages support .md URLs (0/170 tested)
      Learn more: https://agentdocsspec.com/spec/#markdown-url-support
  ✗ content-negotiation: Server ignores Accept: text/markdown header (0/170 pages return markdown)
      Learn more: https://agentdocsspec.com/spec/#content-negotiation

page-size
  ✓ rendering-strategy: All 170 pages contain server-rendered content
  ○ page-size-markdown: Skipped: dependency check did not pass
  ✗ page-size-html: 1 of 170 pages convert to over 100K chars (max 438K HTML → 118K markdown (80% boilerplate))
      Learn more: https://agentdocsspec.com/spec/#page-size-html
  ✗ content-start-position: 28 of 170 pages have content starting past 50% (worst 74%)
      Learn more: https://agentdocsspec.com/spec/#content-start-position

content-structure
  ✗ tabbed-content-serialization: 54 tab group(s) found; worst page serializes to 117K chars (over 100K)
      Learn more: https://agentdocsspec.com/spec/#tabbed-content-serialization
  ⚠ section-header-quality: 1 of 3 page(s) with tab headers don't distinguish between variants
      Learn more: https://agentdocsspec.com/spec/#section-header-quality
  ✓ markdown-code-fence-validity: All 0 code fences properly closed across 1 pages

url-stability
  ✓ http-status-codes: All 170 pages return proper error codes for bad URLs
  ✓ redirect-behavior: No redirects detected across 170 pages

observability
  ✗ llms-txt-coverage: llms.txt covers 0/170 sitemap doc pages (0%); 170 missing
      Learn more: https://agentdocsspec.com/spec/#llms-txt-coverage
  ○ markdown-content-parity: Skipped: dependency check did not pass
  ✓ cache-header-hygiene: All 171 endpoints have appropriate cache headers

authentication
  ✓ auth-gate-detection: All 170 pages are publicly accessible
  ○ auth-alternative-access: All docs pages are publicly accessible; no alternative access paths needed

Summary
  9 passed, 2 warnings, 7 failed, 5 skipped (23 total)

Full spec: https://agentdocsspec.com/spec/

[jessiemongeon1]

Style Guide Audit

All 1 file(s) pass the style guide audit.