feat(02-01): add athena council execution primitives

- Add council execution result and member response types for orchestration
- Implement provider/model parser for BackgroundManager-compatible model input
- Add shared council prompt builder and export new athena modules

src/agents/athena/council-prompt.ts

@@ -0,0 +1,24 @@
+export function buildCouncilPrompt(question: string): string {
+  return `You are a council member in a multi-model analysis council. Your role is to provide independent, thorough analysis of the question below.
+
+## Your Role
+- You are one of several AI models analyzing the same question independently
+- Your analysis should be thorough and evidence-based
+- You are read-only - you cannot modify any files, only analyze
+- Focus on finding real issues, not hypothetical ones
+
+## Instructions
+1. Analyze the question carefully
+2. Search the codebase thoroughly using available tools (Read, Grep, Glob, LSP)
+3. Report your findings with evidence (file paths, line numbers, code snippets)
+4. For each finding, state:
+   - What the issue/observation is
+   - Where it is (file path, line number)
+   - Why it matters (severity: critical/high/medium/low)
+   - Your confidence level (high/medium/low)
+5. Be concise but thorough - quality over quantity
+
+## Question
+
+${question}`
+}

src/agents/athena/index.ts

@@ -1,2 +1,4 @@
 export * from "./types"
+export * from "./model-parser"
+export * from "./council-prompt"
 export * from "../../config/schema/athena"

src/agents/athena/model-parser.ts

@@ -0,0 +1,23 @@
+export interface ParsedModel {
+  providerID: string
+  modelID: string
+}
+
+export function parseModelString(model: string): ParsedModel | null {
+  if (!model) {
+    return null
+  }
+
+  const slashIndex = model.indexOf("/")
+  if (slashIndex <= 0) {
+    return null
+  }
+
+  const providerID = model.substring(0, slashIndex)
+  const modelID = model.substring(slashIndex + 1)
+  if (!modelID) {
+    return null
+  }
+
+  return { providerID, modelID }
+}

src/agents/athena/types.ts

@@ -17,3 +17,20 @@ export interface AthenaConfig {
 export type CouncilMemberStatus = "completed" | "timeout" | "error"
 
 export type AgreementLevel = "unanimous" | "majority" | "minority" | "solo"
+
+export interface CouncilMemberResponse {
+  member: CouncilMemberConfig
+  status: CouncilMemberStatus
+  response?: string
+  error?: string
+  taskId: string
+  durationMs: number
+}
+
+export interface CouncilExecutionResult {
+  question: string
+  responses: CouncilMemberResponse[]
+  totalMembers: number
+  completedCount: number
+  failedCount: number
+}