Install rustfmt and clippy with pinned Rust

.github/workflows/ci.yml

@@ -467,7 +467,9 @@ jobs:
       - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2
 
       - name: Build with the declared MSRV
-        run: cargo +${{ steps.msrv.outputs.version }} build --all-targets --all-features
+        env:
+          MSRV: ${{ steps.msrv.outputs.version }}
+        run: cargo +"$MSRV" build --all-targets --all-features
 
   supply-chain:
     name: Supply chain

crates/tinymemory-module/src/service/mod.rs

@@ -2241,7 +2241,7 @@ impl MemoryService {
     // async only for the interface macro's member contract — the body is one
     // synchronous global write, and that is the point: a claim's step-0 read
     // must never wait on this.
-    #[allow(clippy::unused_async, clippy::unused_async_trait_impl)]
+    #[allow(clippy::unused_async)]
     async fn override_scheduler_gate(&self, seconds: u64) -> BusResult<()> {
         // Clamp: a window longer than an hour is the gate turned off with
         // extra steps, which is the config's job, not this member's.

rust-toolchain.toml

@@ -1,3 +1,4 @@
 [toolchain]
 channel = "1.96.1"
+components = ["rustfmt", "clippy"]
 profile = "minimal"