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>

apps/solvecraft-cli/src/main.rs

@@ -10,6 +10,7 @@
 //! solvecraft-cli oracle <case-dir>...                         replay recipes and compare with measure.json
 //! solvecraft-cli step-corpus <case-dir>...                    import part.step and compare with measure.json
 //! solvecraft-cli mcp [--in design|script] [--connect HOST:PORT] MCP server on stdio (docs/mcp.md)
+//! solvecraft-cli licences                                     SolveCraft's licence and the third-party licences
 //! ```
 #![deny(clippy::unwrap_used, clippy::expect_used, clippy::panic, clippy::unimplemented, clippy::todo, clippy::unreachable)]
 #![forbid(unsafe_code)]
@@ -35,6 +36,7 @@ const USAGE: &str = "usage:
   solvecraft-cli oracle <case-dir>... [--json]
   solvecraft-cli step-corpus <case-dir>... [--json]
   solvecraft-cli mcp [--in design.solvecraft|script.json] [--connect 127.0.0.1:PORT]
+  solvecraft-cli licences
 ";
 
 fn main() -> ExitCode {
@@ -55,6 +57,12 @@ fn main() -> ExitCode {
         Some("oracle") => oracle::run(&args[1..]),
         Some("step-corpus") => oracle::step_corpus(&args[1..]),
         Some("mcp") => cmd_mcp(&args[1..]),
+        Some("licences" | "licenses") => {
+            // Written, not print!ed: a closed pipe (`| head`) is not a crash.
+            use std::io::Write as _;
+            let _ = std::io::stdout().lock().write_all(solvecraft_engine::licences::all().as_bytes());
+            Ok(())
+        }
         // Hidden, for the kill-mid-save test: save a large design over and over.
         Some("save-stress") => cmd_save_stress(&args[1..]),
         // Hidden: time recomputes after parameter edits (docs/perf.md).