Initial commit: noxis JVM bytecode obfuscator

Workspace of 9 crates (noxis, noxis-core, noxis-classfile, noxis-analysis,
noxis-passes, noxis-runtime, noxis-jar, noxis-verify, noxis-structure-check).
AGPL-3.0-only license, Rust 2024 edition, unsafe_code denied.

crates/noxis-structure-check/build.rs

@@ -0,0 +1,9 @@
+//! Bootstrap gate: this crate cannot depend on itself, so it includes the
+//! shared rules source directly instead of going through the crate API.
+
+#[path = "src/rules.rs"]
+mod rules;
+
+fn main() {
+    rules::check();
+}