ci: check dependency licences with cargo-deny on every pull request

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01UhhZMBTviDQxZvwnyP89fo

deny.toml

@@ -1,4 +1,3 @@
-# Licences are covered by `cargo xtask licences --check`.
 [advisories]
 unmaintained = "all"
 yanked = "warn"
@@ -15,3 +14,25 @@ allow-registry = ["https://github.com/rust-lang/crates.io-index"]
 # SolidCraft's kernel and its patched truck crates, pinned by rev in Cargo.toml.
 # storytold/craft-libs: the Craft family's shared UI components (craft-ui), pinned by rev.
 allow-git = ["https://github.com/bherbruck/solidcraft", "https://github.com/storytold/craft-libs"]
+
+# What FieldCraft may ship: permissive licences only (no copyleft). A crate offering
+# a choice (MIT OR LGPL) passes on its permissive option. THIRD-PARTY-LICENSES.txt is generated at
+# release time (`cargo xtask licences`); this is the policy every pull request is held to.
+[licenses]
+confidence-threshold = 0.9
+allow = [
+    "0BSD",
+    "Apache-2.0",
+    "Apache-2.0 WITH LLVM-exception",
+    "BSD-2-Clause",
+    "BSD-3-Clause",
+    "BSL-1.0",
+    "CDLA-Permissive-2.0",
+    "ISC",
+    "MIT",
+    "OFL-1.1",
+    "Ubuntu-font-1.0",
+    "Unicode-3.0",
+    "Unlicense",
+    "Zlib",
+]