fix(athena): remove duplicate council prompt, add temp file cleanup, fix code quality

- Remove COUNCIL_MEMBER_PROMPT from temp file content since it's already
  provided as the council member's system prompt via agent config, saving
  ~350+ tokens per council member per invocation
- Add startup cleanup for stale athena-council-*.md files older than 30
  minutes in .sisyphus/tmp/ to handle cases where process exits before
  setTimeout cleanup fires
- Remove redundant intermediate permission object spread in createAthenaAgent
- Fix test style: it() -> test(), add #given/#then prefixes per conventions

src/tools/prepare-council-prompt/tools.ts

@@ -1,13 +1,38 @@
 import { tool, type ToolDefinition } from "@opencode-ai/plugin"
 import { randomUUID } from "node:crypto"
-import { writeFile, unlink, mkdir } from "node:fs/promises"
+import { writeFile, unlink, mkdir, readdir, stat } from "node:fs/promises"
 import { join } from "node:path"
 import { log } from "../../shared/logger"
-import { COUNCIL_MEMBER_PROMPT, COUNCIL_SOLO_ADDENDUM, COUNCIL_DELEGATION_ADDENDUM } from "../../agents/athena"
+import { COUNCIL_SOLO_ADDENDUM, COUNCIL_DELEGATION_ADDENDUM } from "../../agents/athena"
 
 const CLEANUP_DELAY_MS = 30 * 60 * 1000
 const COUNCIL_TMP_DIR = ".sisyphus/tmp"
 
+const COUNCIL_FILE_PREFIX = "athena-council-"
+
+async function cleanupStaleTempFiles(directory: string): Promise<void> {
+  const tmpDir = join(directory, COUNCIL_TMP_DIR)
+  try {
+    const files = await readdir(tmpDir)
+    const now = Date.now()
+    for (const file of files) {
+      if (!file.startsWith(COUNCIL_FILE_PREFIX) || !file.endsWith(".md")) continue
+      const filePath = join(tmpDir, file)
+      try {
+        const fileStat = await stat(filePath)
+        if (now - fileStat.mtimeMs > CLEANUP_DELAY_MS) {
+          await unlink(filePath)
+          log("[prepare-council-prompt] Cleaned up stale temp file", { filePath })
+        }
+      } catch {
+        // File may have been deleted between readdir and stat
+      }
+    }
+  } catch {
+    // Directory may not exist yet — nothing to clean
+  }
+}
+
 export function createPrepareCouncilPromptTool(directory: string): ToolDefinition {
   const description = `Save a council analysis prompt to a temp file so council members can read it.
 
@@ -21,6 +46,10 @@ The "mode" parameter controls whether council members can delegate exploration t
 
 Returns the file path to reference in subsequent task() calls.`
 
+  cleanupStaleTempFiles(directory).catch((err) => {
+    log("[prepare-council-prompt] Startup cleanup failed", { error: String(err) })
+  })
+
   return tool({
     description,
     args: {
@@ -40,8 +69,7 @@ Returns the file path to reference in subsequent task() calls.`
       const filePath = join(tmpDir, filename)
 
       const modeAddendum = mode === "delegation" ? COUNCIL_DELEGATION_ADDENDUM : COUNCIL_SOLO_ADDENDUM
-      const content = `${COUNCIL_MEMBER_PROMPT}
-${modeAddendum}
+      const content = `${modeAddendum}
 
 ## Analysis Question