fix(athena): enforce strict schema validation for council members

Add .strict() to CouncilMemberSchema to reject unknown fields like temperature. Remove unused Zod-inferred type exports. Add test verifying unknown fields are rejected.

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

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

src/config/schema/athena.test.ts

@@ -111,6 +111,17 @@ describe("CouncilMemberSchema", () => {
     expect(parsed.variant).toBeUndefined()
     expect(parsed.name).toBeUndefined()
   })
+
+  test("rejects member config with unknown fields", () => {
+    //#given
+    const config = { model: "openai/gpt-5.3-codex", temperature: 0.2 }
+
+    //#when
+    const result = CouncilMemberSchema.safeParse(config)
+
+    //#then
+    expect(result.success).toBe(false)
+  })
 })
 
 describe("CouncilConfigSchema", () => {