Production pass: floats, GC, type checking, and tooling

Adds floats, bitwise ops, UTF-8 strings with methods, try/catch,
closures, generics validation, a compile-time type checker, a
mark-and-sweep GC, source-level debug info, constant folding, and
the repl/fmt/package-manager commands.

🤖 Generated with Codebuff
Co-Authored-By: Codebuff <noreply@codebuff.com>

compiler/compiler.v

@@ -8,6 +8,8 @@ import obj
 pub fn compile(src string) !obj.Obj {
 	toks := tokenize(src)!
 	prog := parse(toks)!
+	// conservative compile-time type check; catches provable errors early
+	check(prog)!
 	return gen(prog)
 }
 
@@ -15,3 +17,18 @@ pub fn compile_file(path string) !obj.Obj {
 	src := os.read_file(path)!
 	return compile(src)!
 }
+
+// resolve_import turns an import path into a readable source file. It tries
+// the path as given first, then falls back to the package-manager layout so
+// `import "pkg/file.vr"` finds vendor/pkg/file.vr.
+pub fn resolve_import(path string) !string {
+	if os.exists(path) {
+		return path
+	}
+	for cand in ['vendor/${path}', 'vendor/${path}.vr', 'vendor/${path}/main.vr', 'vendor/${path}/src/main.vr'] {
+		if os.exists(cand) {
+			return cand
+		}
+	}
+	return error('cannot resolve import "${path}" (tried vendor/)"')
+}