Trim em-dashes from the README and add AGENTS.md

AGENTS.md

@@ -0,0 +1,93 @@
+# AGENTS.md
+
+Guidance for AI agents working in this repository.
+
+## What this is
+
+`acag` (article cover art generator) is a native desktop app that generates
+article cover art in five aspect ratios (square, link/Open Graph, wide, portrait,
+banner) in an Omakase / Japanese-constructivist style. Rust +
+[Slint](https://slint.dev) for the GUI, [resvg](https://github.com/linebender/resvg)
+/ tiny-skia for rasterization. Single binary named `acag`.
+
+## Core invariant
+
+`render_cover_svg(&CoverConfig) -> String` (in `src/cover`) is the single source
+of truth. The live preview and both exports rasterize the **same SVG**, so what
+you see is exactly the file you get. Never fork rendering between preview and
+export: change the SVG function and both follow.
+
+## Layout
+
+```
+src/
+  design/   themes · wagara patterns · WCAG contrast
+  cover/    config · format (aspect ratios) · typesetting · render · layouts
+  raster.rs SVG → Pixmap/PNG by longest edge (resvg + embedded Montserrat)
+  export.rs save SVG / PNG (2K or 4K)
+  preset.rs save/load named presets as TOML
+  main.rs   Slint GUI wiring (background export + spinner)
+ui/app.slint     the editor + live preview
+examples/        gallery.rs (docs/samples), icon.rs (app icon + icon.ico)
+build.rs         compiles the Slint UI; embeds the Windows icon resource
+```
+
+The library crate holds all logic and is what tests cover; `main.rs` is thin GUI
+glue. Fonts (Montserrat Black/Bold/Regular) are embedded via `include_bytes!`, so
+no system fonts are needed at runtime.
+
+## Commands
+
+```sh
+cargo run --release            # run the app
+cargo test                     # unit tests
+cargo fmt --all --check        # formatting gate
+cargo clippy --all-targets -- -D warnings   # lint gate
+cargo llvm-cov --lib --fail-under-lines 80  # coverage gate (library ≥ 80%)
+cargo run --example gallery    # regenerate docs/samples
+cargo run --example icon       # regenerate assets/icons/* (PNGs + icon.ico)
+```
+
+CI (`.github/workflows/ci.yml`) runs fmt, clippy `-D warnings`, `cargo test`, and
+library line coverage ≥ 80%. All four must pass; run them before proposing a
+change is done.
+
+## Conventions
+
+- Edition 2024. Note `std::env::set_var` is `unsafe` here; only call it before any
+  threads/backends start (see `main.rs`).
+- Code, comments, and identifiers in English. Prefer full descriptive names, but
+  keep the project's established abbreviations (`config`, `cfg`, `ctx`); match the
+  surrounding code rather than renaming.
+- No filler comments. Comment only non-obvious *why*, not *what*.
+- Tests: cover basic functionality first, then edge cases; keep the library at
+  ≥ 80% lines. Use real types, never ad-hoc untyped mocks.
+- Imports inside the same directory use `crate::...` / `super::...` paths already
+  established in the file; follow the surrounding style.
+
+## Platform & runtime notes
+
+- **Renderer**: defaults to Slint's software (CPU) renderer (`SLINT_BACKEND=winit-software`
+  set in `main.rs` when unset) so it runs without OpenGL (VMs, RDP). Femtovg/GPU
+  is opt-in via `SLINT_BACKEND=winit-femtovg`. Don't assume a GL context exists.
+- **Windows**: `#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]`
+  hides the console for release builds. The `.exe` icon is embedded from
+  `assets/icons/icon.ico` via `winresource` in `build.rs` (only on a Windows host).
+- **Output dirs**: covers go to `~/Pictures/article-covers/` (Linux) /
+  `%USERPROFILE%\Pictures\article-covers\` (Windows), override `ACAG_OUTPUT_DIR`.
+  Presets live under the platform config dir, override `ACAG_PRESETS_DIR`.
+
+## Release
+
+`.github/workflows/release.yml` triggers on `v*` tags: builds a Linux AppImage +
+tarball and a standalone Windows `.exe` (static CRT), attached to the GitHub
+release. The AppImage `.desktop` `Categories` must use only freedesktop-registered
+values (no unregistered `Design`, etc.) or `appimagetool` fails.
+
+## Gotchas
+
+- Keep preview and export pixel-identical: only the rasterization size differs.
+- Regenerate `docs/samples` (`gallery`) and the icon set (`icon`) when their
+  inputs change; both are committed assets.
+- After editing `ui/app.slint`, the build re-runs `slint-build`; mismatched
+  property names surface as compile errors in `main.rs`.

README.md

@@ -8,7 +8,7 @@
 
 <p align="center">
   A native desktop app that generates <strong>article cover art</strong> in an
-  <strong>Omakase / Japanese-constructivist</strong> style — <strong>five aspect ratios</strong>
+  <strong>Omakase / Japanese-constructivist</strong> style: <strong>five aspect ratios</strong>
   (square, link, wide, portrait, banner), six themes, five patterns, three layouts, a live
   preview, exported up to <strong>4K PNG</strong> (plus the source SVG).
 </p>
@@ -29,50 +29,50 @@
 
 ## The idea
 
-Built around **Omakase** (お任せ — "I leave it to you", the sushi chef's choice) and the
+Built around **Omakase** (お任せ, "I leave it to you", the sushi chef's choice) and the
 geometry of traditional Japanese patterns (**wagara**, 和柄), tempered with bold,
 structural, constructivist typography. The result is calm but assertive: a huge
 **Montserrat Black** title, a lot of **Ma** (negative space), and a quiet wave "seal".
 
-The Japanese identity comes **only from geometry and color** — there are deliberately
+The Japanese identity comes **only from geometry and color**; there are deliberately
 **no Japanese glyphs in the artwork**. It shares its design language (themes, wagara,
 the sumi-ê palette) with [skvggor.dev](https://skvggor.dev) and
 [`waka-readme`](https://github.com/skvggor/waka-readme).
 
 ## Features
 
-- **6 sumi-ê themes** — `terracotta` 赤土 · `sumi` 墨 · `matcha` 抹茶 · `washi` 和紙 · `ai` 藍 · `sakura` 桜
-- **5 wagara patterns** — `seigaiha` (waves) · `shippo` (interlocking circles) · `kikko`
+- **6 sumi-ê themes**: `terracotta` 赤土 · `sumi` 墨 · `matcha` 抹茶 · `washi` 和紙 · `ai` 藍 · `sakura` 桜
+- **5 wagara patterns**: `seigaiha` (waves) · `shippo` (interlocking circles) · `kikko`
   (tortoiseshell) · `yabane` (arrow feathers) · `asanoha` (hemp leaf)
-- **3 layouts** — `editorial` (asymmetric), `bloco` (constructivist color block), `ma` (negative space)
-- **5 formats** — `1:1` square, `1.91:1` link/Open Graph (LinkedIn, Facebook, X, Slack),
-  `16:9` wide (native LinkedIn article, YouTube), `4:5` portrait, `2:1` banner — the layouts
+- **3 layouts**: `editorial` (asymmetric), `bloco` (constructivist color block), `ma` (negative space)
+- **5 formats**: `1:1` square, `1.91:1` link/Open Graph (LinkedIn, Facebook, X, Slack),
+  `16:9` wide (native LinkedIn article, YouTube), `4:5` portrait, `2:1` banner; the layouts
   adapt to each ratio
-- **Live preview** — every control updates the preview instantly
+- **Live preview**: every control updates the preview instantly
 - **Adjustable film grain** and **pattern strength** sliders, shown live in the preview
-- **Omakase button** — randomizes the visual style and lets the house plate it for you
-- **Named presets** — save any number of looks as TOML and load/delete any of them (`~/.config/article-cover-art-generator/presets/` on Linux, `%APPDATA%\article-cover-art-generator\presets\` on Windows)
-- **WCAG AAA** — all readable text is forced to ≥ 7:1 contrast against its background
+- **Omakase button**: randomizes the visual style and lets the house plate it for you
+- **Named presets**: save any number of looks as TOML and load/delete any of them (`~/.config/article-cover-art-generator/presets/` on Linux, `%APPDATA%\article-cover-art-generator\presets\` on Windows)
+- **WCAG AAA**: all readable text is forced to ≥ 7:1 contrast against its background
 - **Montserrat** Black / Bold / Regular, embedded in the binary (no system fonts needed)
-- **Export** — **2K or 4K** (longest edge) PNG at each format's exact dimensions, plus the
+- **Export**: **2K or 4K** (longest edge) PNG at each format's exact dimensions, plus the
   resolution-independent source SVG; a non-blocking save (spinner while it rasterizes) and
   optional open-after-export
-- **Native** — Rust + [slint](https://slint.dev) + [resvg](https://github.com/linebender/resvg),
+- **Native**: Rust + [slint](https://slint.dev) + [resvg](https://github.com/linebender/resvg),
   running directly on Wayland (no web view, no Node)
 
 Only the **title** is required; category, date, number and brand are optional, keeping the
 cover generic enough for any platform (blog, dev.to, LinkedIn, X, OG image, thumbnail…).
 
 ## Download
 
-Prebuilt binaries are attached to each [GitHub release](https://github.com/skvggor/acag/releases) — no Rust toolchain or system dependencies required.
+Prebuilt binaries are attached to each [GitHub release](https://github.com/skvggor/acag/releases). No Rust toolchain or system dependencies required.
 
-- **Linux** — `acag-*-x86_64.AppImage` (self-contained: `chmod +x` and run), or `acag-*-linux-x86_64.tar.gz` (raw binary).
-- **Windows** — `acag-*-windows-x86_64.zip` (standalone `acag.exe`, no Visual C++ runtime needed).
+- **Linux**: `acag-*-x86_64.AppImage` (self-contained: `chmod +x` and run), or `acag-*-linux-x86_64.tar.gz` (raw binary).
+- **Windows**: `acag-*-windows-x86_64.zip` (standalone `acag.exe`, no Visual C++ runtime needed).
 
 ### Rendering backend
 
-By default the app uses Slint's **software (CPU) renderer**, so it runs everywhere —
+By default the app uses Slint's **software (CPU) renderer**, so it runs everywhere,
 including headless VMs and RDP sessions without a usable OpenGL driver. For this
 form-plus-preview UI the difference is imperceptible. To opt into GPU rendering:
 
@@ -157,7 +157,7 @@ cargo run --example icon     # regenerate the app icon
 
 ## Credits
 
-- **Montserrat** by Julieta Ulanovsky et al. — [SIL Open Font License](https://github.com/JulietaUla/Montserrat).
+- **Montserrat** by Julieta Ulanovsky et al., under the [SIL Open Font License](https://github.com/JulietaUla/Montserrat).
 - **resvg / tiny-skia** and **slint** for native rendering and UI.
 - Design language shared with [skvggor.dev](https://skvggor.dev) and `waka-readme`.
 

assets/article-cover-art-generator.desktop

@@ -2,7 +2,7 @@
 Type=Application
 Name=acag
 GenericName=Article Cover Art Generator
-Comment=Generate 1:1 article cover art in an Omakase style
+Comment=Generate article cover art in an Omakase style
 Exec=acag
 Icon=article-cover-art-generator
 Terminal=false