fix(athena): resolve 4 compatibility and correctness issues

- Use case-insensitive casing in duplicate name test to verify actual logic
- Align permission type with SDK AgentConfig pattern (as AgentConfig["permission"])
- Move duplicate-name validation from schema to runtime for graceful fallback
- Place skipped members details before 'end your turn' in council guard prompt

src/agents/builtin-agents/athena-council-guard.ts

@@ -1,6 +1,6 @@
 import type { AgentConfig } from "@opencode-ai/sdk"
 
-const MISSING_COUNCIL_PROMPT = `
+const MISSING_COUNCIL_PROMPT_HEADER = `
 
 ## CRITICAL: No Council Members Configured
 
@@ -32,7 +32,9 @@ You have no council members registered. This means the Athena council config is
 }
 \`\`\`
 
-Each member requires \`model\` (\`"provider/model-id"\` format) and \`name\` (display name). Minimum 2 members required. Optional fields: \`variant\`, \`temperature\`.
+Each member requires \`model\` (\`"provider/model-id"\` format) and \`name\` (display name). Minimum 2 members required. Optional fields: \`variant\`, \`temperature\`.`
+
+const MISSING_COUNCIL_PROMPT_FOOTER = `
 
 ---
 
@@ -47,12 +49,14 @@ export function appendMissingCouncilPrompt(
   athenaConfig: AgentConfig,
   skippedMembers?: Array<{ name: string; reason: string }>,
 ): AgentConfig {
-  let prompt = MISSING_COUNCIL_PROMPT
+  let prompt = MISSING_COUNCIL_PROMPT_HEADER
 
   if (skippedMembers && skippedMembers.length > 0) {
     const skipDetails = skippedMembers.map((m) => `- **${m.name}**: ${m.reason}`).join("\n")
     prompt += `\n\n### Why Council Failed\n\nThe following members were skipped:\n${skipDetails}`
   }
 
+  prompt += MISSING_COUNCIL_PROMPT_FOOTER
+
   return { ...athenaConfig, prompt }
 }

src/agents/builtin-agents/council-member-agents.test.ts

@@ -2,12 +2,12 @@ import { describe, expect, test } from "bun:test"
 import { registerCouncilMemberAgents } from "./council-member-agents"
 
 describe("council-member-agents", () => {
-  test("skips duplicate names and disables council when below minimum", () => {
+  test("skips case-insensitive duplicate names and disables council when below minimum", () => {
     //#given
     const config = {
       members: [
         { model: "openai/gpt-5.3-codex", name: "GPT" },
-        { model: "anthropic/claude-opus-4-6", name: "GPT" },
+        { model: "anthropic/claude-opus-4-6", name: "gpt" },
       ],
     }
     //#when