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/tools/athena-council/tools.test.ts

@@ -97,6 +97,30 @@ describe("filterCouncilMembers", () => {
     )
   })
 
+  test("selects named member by model ID when name differs from model", () => {
+    // #given - "Claude" has name "Claude" but model "anthropic/claude-sonnet-4-5"
+    const selectedMembers = ["anthropic/claude-sonnet-4-5"]
+
+    // #when
+    const result = filterCouncilMembers(configuredMembers, selectedMembers)
+
+    // #then - should find the member by model ID even though it has a custom name
+    expect(result.members).toEqual([configuredMembers[0]])
+    expect(result.error).toBeUndefined()
+  })
+
+  test("deduplicates when same member is selected by both name and model", () => {
+    // #given
+    const selectedMembers = ["Claude", "anthropic/claude-sonnet-4-5"]
+
+    // #when
+    const result = filterCouncilMembers(configuredMembers, selectedMembers)
+
+    // #then - should return only one copy
+    expect(result.members).toEqual([configuredMembers[0]])
+    expect(result.error).toBeUndefined()
+  })
+
   test("returns error listing only unmatched names when partially matched", () => {
     // #given
     const selectedMembers = ["claude", "non-existent"]