[michaelkage]

Summary

• Add docs/index.html, a single-file, zero-JavaScript-dependency manual with the requested warm-paper/ink/vermilion design and dense source-aligned documentation.
• Add a playable client-side pipeline simulation for daily entry creation, GitHub issue capture, activity collection failure handling, and latest.json generation. The simulation makes no GitHub writes.
• Document the actual source tree, four workflows, runtime, configuration, data flow, test scope and known constraints.
• Detect the repository from GitHub Pages / GitHub URL and fetch repository metadata, latest release/assets and latest commit date from the public GitHub API.
• Detect iframe embedding and suppress outer navigation/chrome.
• Add .github/workflows/pages.yml using configure-pages, upload-pages-artifact (docs) and deploy-pages.
• Extend Node built-in tests to parse the inline manual script and check the source-aligned demo; include docs in validation path filters.

Verification

• Existing Node test suite plus the new manual tests run in CI on this PR.
• No release is currently published; the manual handles the GitHub API 404 state explicitly.
• GitHub Pages deployment itself requires Pages to be enabled for the repository and the Actions deployment workflow to complete after merge.