chore: add project config, Claude instructions, and reference docs

- CLAUDE.md: project guidance for Claude Code (build commands, conventions,
  editing rules, CI notes)
- AGENTS.md: agent-level task conventions for autonomous editing sessions
- .claude/: skills, memory, and settings for Claude Code integration
- docs/: research-backed LaTeX reference examples (small, medium, large-doc
  templates with latexmkrc, local .sty, CI workflow)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/examples/medium-doc/bib/references.bib

@@ -0,0 +1,8 @@
+@article{knuth1986,
+  author  = {Donald E. Knuth},
+  title   = {The {\TeX}book and Beyond},
+  journal = {TUGboat},
+  year    = {1986},
+  volume  = {7},
+  number  = {3}
+}

docs/examples/medium-doc/latexmkrc

@@ -0,0 +1,4 @@
+$pdflatex = 'pdflatex -interaction=nonstopmode -file-line-error %O %S';
+$pdf_mode = 1;
+$bibtex_use = 2;
+$max_repeat = 5;

docs/examples/medium-doc/src/main.tex

@@ -0,0 +1,23 @@
+\documentclass[11pt]{report}
+
+\usepackage[T1]{fontenc}
+\usepackage[utf8]{inputenc}
+\usepackage{lmodern}
+\usepackage[final]{microtype}
+\usepackage{graphicx}
+\usepackage{booktabs}
+\usepackage{hyperref}
+
+\title{Medium Document Example}
+\author{Your Name}
+\date{\today}
+
+\begin{document}
+\maketitle
+\tableofcontents
+
+\input{sections/intro}
+\input{sections/method}
+\input{sections/results}
+
+\end{document}

docs/examples/medium-doc/src/sections/intro.tex

@@ -0,0 +1,2 @@
+\chapter{Introduction}
+Modular files keep merge conflicts smaller and enable focused reviews.

docs/examples/medium-doc/src/sections/method.tex

@@ -0,0 +1,2 @@
+\chapter{Method}
+This chapter demonstrates splitting technical content across files.

docs/examples/medium-doc/src/sections/results.tex

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+\chapter{Results}
+\begin{table}[htbp]
+\centering
+\begin{tabular}{lr}
+\toprule
+Metric & Value \\
+\midrule
+Accuracy & 0.95 \\
+Runtime (s) & 1.3 \\
+\bottomrule
+\end{tabular}
+\caption{Example table using \texttt{booktabs}.}
+\end{table}