Add optional human-review checkpoint for research documents

[kylymo]

Summary

Adapt the upstream human-review skill for this repository as an optional, user-invoked review checkpoint for academic and thesis workflows.

Proposed scope

Add skills/human-review/SKILL.md with portable instructions to:

• open Markdown, HTML, or localhost-rendered research documents in the visual review tool;
• let the author directly edit prose and leave anchored comments on claims, paragraphs, figures, and tables;
• consume the structured feedback batch returned by Human Review;
• apply edits back to the original Markdown/HTML/MDX source rather than overwriting rendered output;
• preserve LaTeX syntax when a reviewed artifact is derived from LaTeX;
• require a backup or Git checkpoint before applying changes.

Update the README skill table and document the integration as an optional stage, for example:

finalize -> human-review -> logic-check
thesis-review -> human-review -> revision

Constraints

• Keep the Human Review application itself external; do not vendor the full Node application into this repository.
• Support Markdown/HTML/localhost directly. For LaTeX, use a rendered review artifact and map approved edits back to the source.
• Preserve upstream MIT attribution: https://github.com/petergyang/human-review
• Keep the stage user-invoked and do not make it run automatically as part of finalize.

Acceptance criteria

• skills/human-review/SKILL.md passes the repository validator.
• Instructions work with the upstream npx -y human-review CLI.
• The skill handles all pages in a returned feedback batch, including edits, comments, and deletions.
• The skill explicitly prevents writing rendered HTML back over LaTeX or other source files.
• README documents installation, usage, scope, and attribution.
• python3 scripts/validate_skills.py and git diff --check pass.