Releases offer plain programs; the licences are built in

Release assets are now the programs themselves: SolveCraft and solvecraft-cli .exe for Windows,
plain Linux binaries plus the AppImage, a macOS .dmg (SolveCraft.app with an Applications link) and
the universal CLI binary; only the web app stays a zip. The notes template takes {tag}, says to
chmod +x on Linux and macOS, and GitHub adds the change list.

Since no LICENSE or NOTICE file rides along any more, the programs carry them:
THIRD-PARTY-LICENSES.txt (written by `cargo xtask licences` from cargo metadata and each shipped
crate's own licence files, 419 crates; `cargo xtask ci` checks it is current) is embedded with
LICENSE-MIT, LICENSE-APACHE and NOTICE in solvecraft_engine::licences, shown in Help ▸ About ▸
Licences (third-party text laid out by visible rows) and printed by `solvecraft-cli licences`.
Scenario s44_about_licences.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/engine/src/lib.rs

@@ -10,6 +10,7 @@
 pub mod cmd;
 pub mod frames;
 pub mod legacy_ids;
+pub mod licences;
 pub mod params;
 pub mod recovery;
 pub mod sample;

crates/engine/src/licences.rs

@@ -0,0 +1,26 @@
+//! SolveCraft's licence texts and the third-party licences, built into every program so a single
+//! downloaded executable carries them (Help ▸ About ▸ Licences, `solvecraft-cli licences`).
+//! THIRD-PARTY-LICENSES.txt is written by `cargo xtask licences` and checked by `cargo xtask ci`.
+
+pub const LICENSE_MIT: &str = include_str!("../../../LICENSE-MIT");
+pub const LICENSE_APACHE: &str = include_str!("../../../LICENSE-APACHE");
+pub const NOTICE: &str = include_str!("../../../NOTICE");
+pub const THIRD_PARTY: &str = include_str!("../../../THIRD-PARTY-LICENSES.txt");
+
+/// Everything, as one text.
+pub fn all() -> String {
+    let rule = "=".repeat(80);
+    format!(
+        "SolveCraft is licensed under the MIT License or the Apache License, Version 2.0, at your option.\n\n{rule}\nNOTICE\n{rule}\n\n{NOTICE}\n{rule}\nLICENSE-MIT\n{rule}\n\n{LICENSE_MIT}\n{rule}\nLICENSE-APACHE\n{rule}\n\n{LICENSE_APACHE}\n{rule}\n{THIRD_PARTY}"
+    )
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn the_licences_are_built_in() {
+        assert!(super::LICENSE_MIT.contains("MIT License") && super::LICENSE_APACHE.contains("Apache License"));
+        assert!(super::THIRD_PARTY.contains("truck") && super::THIRD_PARTY.contains("egui"));
+        assert!(super::all().contains("NOTICE"));
+    }
+}

crates/ui-egui/src/help.rs

@@ -13,8 +13,7 @@ pub const BUILD_DATE: &str = env!("SOLVECRAFT_BUILD_DATE");
 /// The user and developer guide (docs/book, published by .github/workflows/pages.yml).
 pub const DOCS_URL: &str = "https://bherbruck.github.io/solvecraft/";
 const ATTRIBUTION: &str = include_str!("../../../ATTRIBUTION.md");
-const LICENSE_MIT: &str = include_str!("../../../LICENSE-MIT");
-const LICENSE_APACHE: &str = include_str!("../../../LICENSE-APACHE");
+use solvecraft_engine::licences::{LICENSE_APACHE, LICENSE_MIT, NOTICE, THIRD_PARTY};
 /// Fonts: what this build carries.
 pub const FONTS: &str = "The interface uses egui's built-in fonts (Ubuntu Light and Hack, under the Ubuntu Font Licence and \
 the MIT/Bitstream Vera licence; Noto Emoji and the emoji icon font, under the OFL and MIT). Sketch text uses Liberation Sans \
@@ -112,17 +111,28 @@ fn about(app: &mut SolveApp, ctx: &egui::Context) {
             });
             ui.separator();
             egui::ScrollArea::vertical().show(ui, |ui| {
-                egui::CollapsingHeader::new("Attributions (ATTRIBUTION.md)").default_open(true).show(ui, |ui| {
+                egui::CollapsingHeader::new("Attributions (ATTRIBUTION.md)").show(ui, |ui| {
                     ui.label(RichText::new(ATTRIBUTION).monospace().size(11.0));
                 });
                 egui::CollapsingHeader::new("Fonts").show(ui, |ui| {
                     ui.label(FONTS);
                 });
-                egui::CollapsingHeader::new("MIT licence").show(ui, |ui| {
-                    ui.label(RichText::new(LICENSE_MIT).monospace().size(11.0));
-                });
-                egui::CollapsingHeader::new("Apache licence 2.0").show(ui, |ui| {
-                    ui.label(RichText::new(LICENSE_APACHE).monospace().size(11.0));
+                egui::CollapsingHeader::new("Licences").show(ui, |ui| {
+                    egui::CollapsingHeader::new("NOTICE").show(ui, |ui| {
+                        ui.label(RichText::new(NOTICE).monospace().size(11.0));
+                    });
+                    egui::CollapsingHeader::new("MIT licence").show(ui, |ui| {
+                        ui.label(RichText::new(LICENSE_MIT).monospace().size(11.0));
+                    });
+                    egui::CollapsingHeader::new("Apache licence 2.0").show(ui, |ui| {
+                        ui.label(RichText::new(LICENSE_APACHE).monospace().size(11.0));
+                    });
+                    egui::CollapsingHeader::new("Third-party licences").show(ui, |ui| {
+                        if ui.button("Copy all licences").clicked() {
+                            ctx.copy_text(solvecraft_engine::licences::all());
+                        }
+                        third_party(ui);
+                    });
                 });
             });
         });
@@ -131,6 +141,19 @@ fn about(app: &mut SolveApp, ctx: &egui::Context) {
     }
 }
 
+/// THIRD-PARTY-LICENSES.txt (over 10 000 lines): only the lines in view are laid out.
+fn third_party(ui: &mut egui::Ui) {
+    let lines: Vec<&str> = THIRD_PARTY.lines().collect();
+    let font = egui::FontId::monospace(11.0);
+    let row_h = ui.fonts_mut(|f| f.row_height(&font));
+    egui::ScrollArea::both().id_salt("sc_third_party").max_height(360.0).show_rows(ui, row_h, lines.len(), |ui, rows| {
+        for line in lines.get(rows).unwrap_or_default() {
+            // One row per line (show_rows needs equal rows): long lines scroll sideways.
+            ui.add(egui::Label::new(RichText::new(*line).font(font.clone())).extend());
+        }
+    });
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;

crates/ui-egui/tests/scenarios/s44_about_licences.json

@@ -0,0 +1,9 @@
+[
+  {"note": "Help ▸ About ▸ Licences shows SolveCraft's licences and every third-party crate's, built into the program."},
+  {"call": "ui.help", "params": {"item": "about"}},
+  {"widget": "Licences"},
+  {"expect": {"shown": "Third-party licences"}},
+  {"widget": "Third-party licences"},
+  {"expect": {"shown": "Copy all licences"}},
+  {"expect": {"shown": "Third-party software in SolveCraft"}}
+]