fix(athena): harden council members — compaction recovery, block TodoWrite, analysis mode

- Add session.compacted handler in BackgroundManager to prevent premature
  task completion after compaction (defer first post-compaction idle)
- Explicitly block TodoWrite/TodoRead for council members in all sync
  points (AgentConfig permission + session tools + prompt instructions)
- Add council member prefix check to todo-continuation-enforcer skip list
  to prevent infinite continuation loops on completed council members
- Add optional analysis mode (solo/delegation) question to Athena setup:
  solo = thorough but heavier, delegation = fast via explore/librarian
- Allow call_omo_agent in council member allow-list for delegation mode
- Update COUNCIL_MEMBER_PROMPT with TodoWrite prohibition and delegation
  addendum for when delegation mode is selected
- Update prepare_council_prompt tool with mode parameter

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

@@ -3,7 +3,7 @@ import { randomUUID } from "node:crypto"
 import { writeFile, unlink, mkdir } from "node:fs/promises"
 import { join } from "node:path"
 import { log } from "../../shared/logger"
-import { COUNCIL_MEMBER_PROMPT } from "../../agents/athena/council-member-agent"
+import { COUNCIL_MEMBER_PROMPT, COUNCIL_DELEGATION_ADDENDUM } from "../../agents/athena/council-member-agent"
 
 const CLEANUP_DELAY_MS = 30 * 60 * 1000
 const COUNCIL_TMP_DIR = ".sisyphus/tmp"
@@ -15,25 +15,32 @@ Athena-only tool. Saves the prompt once, then each council member task() call us
 "Read <path>" instruction instead of repeating the full question. This keeps task() calls
 fast and small.
 
+The "mode" parameter controls whether council members can delegate exploration to subagents:
+- "solo" (default): Members do all exploration themselves. More thorough but uses more tokens.
+- "delegation": Members can delegate to explore/librarian agents. Faster, lighter context.
+
 Returns the file path to reference in subsequent task() calls.`
 
   return tool({
     description,
     args: {
       prompt: tool.schema.string().describe("The full analysis prompt/question for council members"),
+      mode: tool.schema.string().optional().describe('Analysis mode: "solo" (default) or "delegation"'),
     },
-    async execute(args: { prompt: string }) {
+    async execute(args: { prompt: string; mode?: string }) {
       if (!args.prompt?.trim()) {
         return "Prompt cannot be empty."
       }
 
+      const mode = args.mode === "delegation" ? "delegation" : "solo"
       const tmpDir = join(directory, COUNCIL_TMP_DIR)
       await mkdir(tmpDir, { recursive: true })
 
       const filename = `athena-council-${randomUUID().slice(0, 8)}.md`
       const filePath = join(tmpDir, filename)
 
-      const content = `${COUNCIL_MEMBER_PROMPT}
+      const delegationSection = mode === "delegation" ? `\n${COUNCIL_DELEGATION_ADDENDUM}` : ""
+      const content = `${COUNCIL_MEMBER_PROMPT}${delegationSection}
 
 ## Analysis Question
 
@@ -45,9 +52,9 @@ ${args.prompt}`
         unlink(filePath).catch(() => {})
       }, CLEANUP_DELAY_MS)
 
-      log("[prepare-council-prompt] Saved prompt", { filePath, length: args.prompt.length })
+      log("[prepare-council-prompt] Saved prompt", { filePath, length: args.prompt.length, mode })
 
-      return `Council prompt saved to: ${filePath}
+      return `Council prompt saved to: ${filePath} (mode: ${mode})
 
 Use this path in each council member's task() call:
 - prompt: "Read ${filePath} for your instructions."