test(04-01): add Athena registration and schema regressions

- verify Athena primary agents honor uiSelectedModel and override precedence

- add schema tests to lock athena acceptance in builtin and overridable names

src/agents/utils.test.ts

@@ -147,6 +147,69 @@ describe("createBuiltinAgents with model overrides", () => {
     }
   })
 
+  test("Athena uses uiSelectedModel when provided", async () => {
+    // #given
+    const fetchSpy = spyOn(shared, "fetchAvailableModels").mockResolvedValue(
+      new Set(["openai/gpt-5.2", "anthropic/claude-opus-4-6"])
+    )
+    const uiSelectedModel = "openai/gpt-5.2"
+
+    try {
+      // #when
+      const agents = await createBuiltinAgents(
+        [],
+        {},
+        undefined,
+        TEST_DEFAULT_MODEL,
+        undefined,
+        undefined,
+        [],
+        undefined,
+        undefined,
+        uiSelectedModel
+      )
+
+      // #then
+      expect(agents.athena).toBeDefined()
+      expect(agents.athena.model).toBe("openai/gpt-5.2")
+    } finally {
+      fetchSpy.mockRestore()
+    }
+  })
+
+  test("user config model takes priority over uiSelectedModel for athena", async () => {
+    // #given
+    const fetchSpy = spyOn(shared, "fetchAvailableModels").mockResolvedValue(
+      new Set(["openai/gpt-5.2", "anthropic/claude-opus-4-6"])
+    )
+    const uiSelectedModel = "openai/gpt-5.2"
+    const overrides = {
+      athena: { model: "anthropic/claude-opus-4-6" },
+    }
+
+    try {
+      // #when
+      const agents = await createBuiltinAgents(
+        [],
+        overrides,
+        undefined,
+        TEST_DEFAULT_MODEL,
+        undefined,
+        undefined,
+        [],
+        undefined,
+        undefined,
+        uiSelectedModel
+      )
+
+      // #then
+      expect(agents.athena).toBeDefined()
+      expect(agents.athena.model).toBe("anthropic/claude-opus-4-6")
+    } finally {
+      fetchSpy.mockRestore()
+    }
+  })
+
   test("Sisyphus is created on first run when no availableModels or cache exist", async () => {
     // #given
     const systemDefaultModel = "anthropic/claude-opus-4-6"
@@ -428,7 +491,8 @@ describe("createBuiltinAgents with model overrides", () => {
       )
 
       // #then
-      const matches = (agents.sisyphus?.prompt ?? "").match(/Custom agent: researcher/gi) ?? []
+      expect(agents.sisyphus.prompt).toBeDefined()
+      const matches = (agents.sisyphus.prompt ?? "").match(/Custom agent: researcher/gi) ?? []
       expect(matches.length).toBe(1)
     } finally {
       fetchSpy.mockRestore()

src/config/schema/agent-names.test.ts

@@ -0,0 +1,26 @@
+import { describe, expect, test } from "bun:test"
+import { BuiltinAgentNameSchema, OverridableAgentNameSchema } from "./agent-names"
+
+describe("agent name schemas", () => {
+  test("BuiltinAgentNameSchema accepts athena", () => {
+    //#given
+    const candidate = "athena"
+
+    //#when
+    const result = BuiltinAgentNameSchema.safeParse(candidate)
+
+    //#then
+    expect(result.success).toBe(true)
+  })
+
+  test("OverridableAgentNameSchema accepts athena", () => {
+    //#given
+    const candidate = "athena"
+
+    //#when
+    const result = OverridableAgentNameSchema.safeParse(candidate)
+
+    //#then
+    expect(result.success).toBe(true)
+  })
+})