merge: enforce CI gates the contributor rules already required (D1, A3, A4, D2)

Add cargo fmt --check (strict) and cargo clippy (advisory) to CI, ratchet the
traceability threshold 50 -> 82, add a dangling-ID gate, and fix the
offlineCatalog flake (cold dynamic import, not a timer).

src/lib/services/offlineCatalog.test.ts

@@ -23,6 +23,13 @@ const h = vi.hoisted(() => {
         fn(value);
         return () => subs.delete(fn);
       },
+      // Drop subscribers left behind by module instances discarded via
+      // `vi.resetModules()`. Without this, every previously-imported copy of the
+      // service still reacts to `set()` and pushes its own visibility value.
+      reset(v: T) {
+        subs.clear();
+        value = v;
+      },
     };
   }
   return {
@@ -31,6 +38,21 @@ const h = vi.hoisted(() => {
   };
 });
 
+// Prime the module graph once, at collection time, instead of inside a test.
+//
+// Every test re-imports the service after `vi.resetModules()` so it gets a fresh
+// set of module-level subscriptions. The *first* of those imports also pays to
+// transform the service and its dependency graph — around a second of real
+// wall-clock work with a cold Vite cache. Charged to a test body that cost sat
+// close enough to vitest's 5s default that suite-wide contention (many workers
+// transforming at once) tipped this file into a timeout, while running the file
+// alone always passed. Warming here moves the compile out of the timed region;
+// the per-test re-imports that follow are cached and cost ~30ms.
+//
+// The timeout is deliberately left at the default: the point is to stop timing
+// the compiler, not to give it a bigger budget.
+await import("./offlineCatalog");
+
 vi.mock("$lib/stores/connectivity", () => ({
   isConnected: { subscribe: h.isConnectedStore.subscribe },
 }));
@@ -50,8 +72,8 @@ vi.mock("$lib/stores/auth", () => ({
 
 describe("pushCatalogVisibility resolves reachable || showCatalog (UT-068)", () => {
   beforeEach(() => {
+    h.isConnectedStore.reset(true);
     h.setShowServerCatalog.mockClear();
-    h.isConnectedStore.set(true);
     vi.resetModules();
   });