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/model-fallback/hook.test.ts

@@ -400,7 +400,7 @@ describe("model fallback hook", () => {
     //#when
     await hook["chat.message"]?.({ sessionID }, output)
 
-    //#then — model name should be transformed from hyphen to dot notation
+    //#then - model name should be transformed from hyphen to dot notation
     expect(output.message["model"]).toEqual({
       providerID: "github-copilot",
       modelID: "claude-sonnet-4.6",