Add README, context, scratch and ingest folders

README.md

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+# Paper template
+
+This repository is a template for an academic paper in LaTeX, written with Claude Code as an assistant.  It compiles as it is and contains placeholder content.
+
+## Layout
+
+`main.tex` uses the article class; a marked block at its top switches it to a venue class, whose files go in `venue/`.  It loads the macros in `macros/` and inputs the sections in `sections/` and the proofs in `appendix/`.  Every symbol of the paper is a macro in `macros/notation.tex`, listed with its meaning in `context/notation.md`.  Figures are standalone TikZ files in `figures/src/` that read their data from `figures/data/`, and the paper includes their compiled PDFs from `figures/build/`.  The references are in `bib/refs.bib`, processed by biblatex with biber.
+
+`context/` contains the material Claude Code works from: the outline with the claims of the paper and the goal of each section, the notation table, and referee reviews, which Claude Code does not edit; and the related papers, which Claude Code downloads into `context/related-papers/` as `<year>-<first-author-surname>-<title-slug>.pdf`, each with a `.md` file of notes.  When a download is blocked, you save the file from Firefox into `ingest/`, and Claude Code moves it to `context/related-papers/`.  `scratch/` contains explorations, one dated folder each, indexed in `scratch/README.md`.  `.claude/` contains the permissions of Claude Code and the commands `/review-section`, `/check-notation`, `/tighten-prose` and `/new-scratch`.  `CLAUDE.md` contains the rules Claude Code follows and imports two files: `writing-style-guide.md`, the style guide, and `claudese.md`, the list of banned words and phrases.  `.mcp.json` registers the dblp MCP server.
+
+Entries from dblp, through the dblp MCP server or `dblp-cli bibtex <key>`, may be added to `bib/refs.bib` at any time.
+
+## Building
+
+`make` compiles the figures, then the paper with latexmk into `build/make/`, and copies the PDF to `main.pdf`.  `make figures` compiles each `figures/src/*.tex` into `figures/build/`, and recompiles a figure when its source or a file in `figures/data/` has changed.  `make watch` runs latexmk in continuous mode into `build/`, the folder vimtex also uses through `.latexmkrc`; since `make` writes into `build/make/`, it can run while vimtex or `make watch` is compiling.  `make clean` removes `build/` and `figures/build/`.  `make arxiv` writes `build/arxiv.tar.gz` with the sources, the compiled figures and the `.bbl` file, without `context/`, `scratch/`, `ingest/`, `.claude/`, `CLAUDE.md`, `writing-style-guide.md`, `claudese.md` and `.mcp.json`.  `make wordcount` runs texcount over `sections/` and `appendix/`.

context/notation.md

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+# Notation
+
+Every symbol of the paper has a macro in `macros/notation.tex` and a row here.
+
+| Symbol | Macro | Meaning |
+|---|---|---|
+| λ | `\secpar` | security parameter |
+| negl | `\negl` | negligible function |
+| 𝒫 | `\parties` | set of parties |

context/outline.md

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+# Outline
+
+## Problem
+
+<The problem the paper solves, and why prior work does not solve it.>
+
+## Contributions
+
+1. <Claim.>
+2. <Claim.>
+3. <Claim.>
+
+## Section goals
+
+### 1. Introduction
+
+<What the reader knows after this section.>
+
+### 2. Model
+
+<What the reader knows after this section.>
+
+### 3. Construction
+
+<What the reader knows after this section.>
+
+### 4. Security
+
+<What the reader knows after this section, and which claims above it proves.>
+
+### 5. Evaluation
+
+<What the reader knows after this section, and which claims above it shows.>
+
+### 6. Related work
+
+<What the reader knows after this section.>
+
+### 7. Conclusion
+
+<What the reader knows after this section.>
+
+### Appendix: Proofs
+
+<The proofs it contains.>

scratch/README.md

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+# Scratch
+
+Each exploration has one folder, `scratch/YYYY-MM-DD-<slug>/`, with a `notes.md` recording its goal, what was tried and the outcome.  Command output Claude Code needs, and anything else the exploration produces, goes in the same folder; PDFs and `build/` folders under `scratch/` are not committed.  The command `/new-scratch <slug>` creates the folder and adds its row to the index below.
+
+## Index
+
+| Date | Slug | Goal | Outcome |
+|---|---|---|---|