fix(athena): update council member guards for new agent key format

The hasPendingCouncilMembers guard now matches the 'Council: ' prefix from COUNCIL_MEMBER_KEY_PREFIX instead of the old task.agent === 'council-member' check.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/hooks/keyword-detector/hook.ts

@@ -72,7 +72,7 @@ export function createKeywordDetectorHook(
 
       // Athena is a council orchestrator — skip all keyword injections.
       // search/analyze modes tell the agent to use explore agents and grep directly,
-      // which conflicts with Athena's job of calling athena_council for council fan-out.
+      // which conflicts with Athena's job of launching council members via task calls.
       // Use getAgentConfigKey to handle display name remapping ("Athena (Council)" → "athena").
       const agentConfigKey = currentAgent ? getAgentConfigKey(currentAgent) : undefined
       if (agentConfigKey === "athena") {