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/plugin/tool-execute-before.ts

@@ -80,8 +80,9 @@ export function createToolExecuteBeforeHandler(args: {
     const toolNameLower = input.tool?.toLowerCase()
 
     if (toolNameLower === "question" || toolNameLower === "askuserquestion" || toolNameLower === "ask_user_question" || toolNameLower === "switch_agent") {
-      if (hasPendingCouncilMembers(input.sessionID)) {
-        const sessionAgent = await resolveSessionAgent(ctx.client, input.sessionID)
+      const sessionID = input.sessionID || getMainSessionID()
+      if (sessionID && hasPendingCouncilMembers(sessionID)) {
+        const sessionAgent = await resolveSessionAgent(ctx.client, sessionID)
         const sessionAgentKey = sessionAgent ? getAgentConfigKey(sessionAgent) : undefined
 
         if (sessionAgentKey === "athena") {