fix: resolve 7 council-validated PR violations

- Fix misleading background_wait instructions to show loop pattern with
  remaining_task_ids (race semantics, not block-all)
- Fix wrong Gemini model string: gemini-3-pro-preview → gemini-3-pro
- Add getMainSessionID() fallback when input.sessionID is undefined
- Narrow .gitignore packages/ to only ignore built binaries
- Fix contradictory config doc: non_interactive_members 'all' → 'custom'
- Add athena-junior to keyword-detector exclusion check
- Add .trim() before .toUpperCase() in resolveCouncilIntent
- Update snapshots for model string change

src/hooks/keyword-detector/hook.ts

@@ -70,12 +70,12 @@ export function createKeywordDetectorHook(
         }
       }
 
-      // Athena is a council orchestrator — skip all keyword injections.
+      // Athena and Athena-Junior are council orchestrators — skip all keyword injections.
       // search/analyze modes tell the agent to use explore agents and grep directly,
       // 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") {
+      if (agentConfigKey === "athena" || agentConfigKey === "athena-junior") {
         if (detectedKeywords.length > 0) {
           log(`[keyword-detector] Skipping keywords for Athena (council orchestrator)`, {
             sessionID: input.sessionID,