fix(athena): address 6 council review findings — launcher, schema, filtering, presentation

- Forward temperature and permission through council-launcher to background manager
- Add LaunchInput.temperature and LaunchInput.permission to background-agent types
- Extract session guard with 5-minute timeout to prevent stale council locks
- Make council optional in AthenaOverrideConfigSchema for partial user overrides
- Support member lookup by both name and model ID in filterCouncilMembers
- Add provider/model-id format validation to CouncilMemberSchema
- Fix findings-presenter group header to show finding count instead of first finding's reporter count

src/config/schema.test.ts

@@ -625,7 +625,7 @@ describe("Athena agent override", () => {
       expect(result.data.agents?.athena?.model).toBe("openai/gpt-5.3-codex")
       expect(result.data.agents?.athena?.temperature).toBe(0.2)
       expect(result.data.agents?.athena?.prompt_append).toBe("Use consensus-first synthesis.")
-      expect(result.data.agents?.athena?.council.members).toHaveLength(3)
+      expect(result.data.agents?.athena?.council?.members).toHaveLength(3)
     }
   })
 
@@ -648,7 +648,7 @@ describe("Athena agent override", () => {
     expect(result.success).toBe(false)
   })
 
-  test("rejects athena override when council is missing", () => {
+  test("accepts athena override without council (temperature-only override)", () => {
     // given
     const config = {
       agents: {
@@ -662,7 +662,7 @@ describe("Athena agent override", () => {
     const result = OhMyOpenCodeConfigSchema.safeParse(config)
 
     // then
-    expect(result.success).toBe(false)
+    expect(result.success).toBe(true)
   })
 })
 

src/config/schema/agent-overrides.ts

@@ -58,7 +58,7 @@ export const AgentOverrideConfigSchema = z.object({
 
 export const AthenaOverrideConfigSchema = AgentOverrideConfigSchema.merge(
   z.object({
-    council: AthenaConfigSchema.shape.council,
+    council: AthenaConfigSchema.shape.council.optional(),
   })
 )
 

src/config/schema/athena.test.ts

@@ -41,6 +41,50 @@ describe("CouncilMemberSchema", () => {
     expect(result.success).toBe(false)
   })
 
+  test("rejects model string without provider/model separator", () => {
+    //#given
+    const config = { model: "invalid-model" }
+
+    //#when
+    const result = CouncilMemberSchema.safeParse(config)
+
+    //#then
+    expect(result.success).toBe(false)
+  })
+
+  test("rejects model string with empty provider", () => {
+    //#given
+    const config = { model: "/gpt-5.3-codex" }
+
+    //#when
+    const result = CouncilMemberSchema.safeParse(config)
+
+    //#then
+    expect(result.success).toBe(false)
+  })
+
+  test("rejects model string with empty model ID", () => {
+    //#given
+    const config = { model: "openai/" }
+
+    //#when
+    const result = CouncilMemberSchema.safeParse(config)
+
+    //#then
+    expect(result.success).toBe(false)
+  })
+
+  test("rejects empty model string", () => {
+    //#given
+    const config = { model: "" }
+
+    //#when
+    const result = CouncilMemberSchema.safeParse(config)
+
+    //#then
+    expect(result.success).toBe(false)
+  })
+
   test("rejects temperature below 0", () => {
     //#given
     const config = { model: "openai/gpt-5.3-codex", temperature: -0.1 }

src/config/schema/athena.ts

@@ -1,7 +1,19 @@
 import { z } from "zod"
 
+/** Validates model string format: "provider/model-id" (e.g., "openai/gpt-5.3-codex"). */
+const ModelStringSchema = z
+  .string()
+  .min(1)
+  .refine(
+    (model) => {
+      const slashIndex = model.indexOf("/")
+      return slashIndex > 0 && slashIndex < model.length - 1
+    },
+    { message: 'Model must be in "provider/model-id" format (e.g., "openai/gpt-5.3-codex")' }
+  )
+
 export const CouncilMemberSchema = z.object({
-  model: z.string(),
+  model: ModelStringSchema,
   temperature: z.number().min(0).max(2).optional(),
   variant: z.string().optional(),
   name: z.string().optional(),