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 <[email protected]>

.github/release/package-linux.sh

@@ -1,14 +1,13 @@
 #!/usr/bin/env bash
-# Package the Linux release build: a tar.gz with both binaries, and an AppImage of the desktop app.
-# Usage: .github/release/package-linux.sh <tag>   (from the repository root, after
+# Package the Linux release build: the app and the CLI as plain binaries, and an AppImage of the
+# app. Usage: .github/release/package-linux.sh <tag>   (from the repository root, after
 # `cargo build --release -p solvecraft -p solvecraft-cli`). Writes out/.
 set -euo pipefail
 tag=${1:?usage: package-linux.sh <tag>}
 bin=${CARGO_TARGET_DIR:-target}/release
-name="solvecraft-$tag-linux-x86_64"
-rm -rf stage out && mkdir -p "stage/$name" out
-cp "$bin/solvecraft" "$bin/solvecraft-cli" README.md LICENSE-MIT LICENSE-APACHE NOTICE ATTRIBUTION.md "stage/$name/"
-tar -C stage -czf "out/$name.tar.gz" "$name"
+rm -rf stage out && mkdir -p stage out
+cp "$bin/solvecraft" "out/solvecraft-$tag-linux-x86_64"
+cp "$bin/solvecraft-cli" "out/solvecraft-cli-$tag-linux-x86_64"
 
 # AppImage. The icon is rendered by SolveCraft itself from the bracket example, so no image file
 # is committed.