asked the clanker to change the arcidecture a bit

crates/modules/src/lib.rs

@@ -0,0 +1,10 @@
+//! Bar module registry: constructs every enabled module. Adding a module is
+//! a new crate under `crates/modules/` plus one entry in `all()` — core
+//! never changes.
+
+use common::BarModule;
+
+/// One instance of every enabled module, ready to insert by `id()`.
+pub fn all() -> Vec<Box<dyn BarModule>> {
+    vec![Box::new(module_clock::Clock::new())]
+}