test(hooks): remove unsafe test assertions

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

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

src/hooks/runtime-fallback/fallback-models.test.ts

@@ -12,13 +12,13 @@ describe("runtime-fallback fallback-models", () => {
     //#given
     const sessionID = "ses_runtime_fallback_category"
     SessionCategoryRegistry.register(sessionID, "quick")
-    const pluginConfig = {
+    const pluginConfig = testCoerce({
       categories: {
         quick: {
           fallback_models: ["openai/gpt-5.2", "anthropic/claude-opus-4-7"],
         },
       },
-    } as any
+    })
 
     //#when
     const result = getFallbackModelsForSession(sessionID, undefined, pluginConfig)
@@ -29,13 +29,13 @@ describe("runtime-fallback fallback-models", () => {
 
   test("uses agent-specific fallback_models when agent is resolved", () => {
     //#given
-    const pluginConfig = {
+    const pluginConfig = testCoerce({
       agents: {
         oracle: {
           fallback_models: ["openai/gpt-5.2", "anthropic/claude-opus-4-7"],
         },
       },
-    } as any
+    })
 
     //#when
     const result = getFallbackModelsForSession("ses_runtime_fallback_agent", "oracle", pluginConfig)
@@ -46,7 +46,7 @@ describe("runtime-fallback fallback-models", () => {
 
   test("does not fall back to another agent chain when agent cannot be resolved", () => {
     //#given
-    const pluginConfig = {
+    const pluginConfig = testCoerce({
       agents: {
         sisyphus: {
           fallback_models: ["quotio/gpt-5.2", "quotio/glm-5", "quotio/kimi-k2.5"],
@@ -55,7 +55,7 @@ describe("runtime-fallback fallback-models", () => {
           fallback_models: ["openai/gpt-5.2", "anthropic/claude-opus-4-7"],
         },
       },
-    } as any
+    })
 
     //#when
     const result = getFallbackModelsForSession("ses_runtime_fallback_unknown", undefined, pluginConfig)

src/hooks/runtime-fallback/index.test.ts

@@ -41,7 +41,7 @@ describe("runtime-fallback", () => {
       abort?: (args: unknown) => Promise<unknown>
     }
   }) {
-    return {
+    return testCoerce({
       client: {
         tui: {
           showToast: async (opts: { body: { title: string; message: string; variant: string; duration: number } }) => {
@@ -59,7 +59,7 @@ describe("runtime-fallback", () => {
         },
       },
       directory: "/test/dir",
-    } as any
+    })
   }
 
   function createMockConfig(overrides?: Partial<RuntimeFallbackConfig>): RuntimeFallbackConfig {