refactor: replace em dashes with hyphens in test files and docs

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/hooks/runtime-fallback/error-classifier.test.ts

@@ -134,7 +134,7 @@ describe("extractStatusCode", () => {
   })
 
   test("skips non-numeric status and finds deeper numeric statusCode", () => {
-    //#given — status is a string, but error.statusCode is numeric
+    //#given - status is a string, but error.statusCode is numeric
     const error = {
       status: "error",
       error: { statusCode: 429 },