fix: Strengthen AskUserQuestion guidance for cross-platform compatibility

- codex-agents.ts: replace vague "ask the user in chat" with structured
  numbered-list instructions for Codex AGENTS.md context
- CLAUDE.md: add AskUserQuestion policy to skill compliance checklist
  to prevent recurrence in future skills

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

plugins/compound-engineering/CLAUDE.md

@@ -75,6 +75,11 @@ When adding or modifying skills, verify compliance with skill-creator spec:
 - [ ] Use imperative/infinitive form (verb-first instructions)
 - [ ] Avoid second person ("you should") - use objective language ("To accomplish X, do Y")
 
+### AskUserQuestion Usage
+
+- [ ] If the skill uses `AskUserQuestion`, it must include an "Interaction Method" preamble explaining the numbered-list fallback for non-Claude environments
+- [ ] Prefer avoiding `AskUserQuestion` entirely (see `brainstorming/SKILL.md` pattern) for skills intended to run cross-platform
+
 ### Quick Validation Command
 
 ```bash

src/utils/codex-agents.ts

@@ -18,7 +18,7 @@ Tool mapping:
 - Glob: use rg --files or find
 - LS: use ls via shell_command
 - WebFetch/WebSearch: use curl or Context7 for library docs
-- AskUserQuestion/Question: ask the user in chat
+- AskUserQuestion/Question: present choices as a numbered list in chat and wait for a reply number. For multi-select (multiSelect: true), accept comma-separated numbers. Never skip or auto-configure — always wait for the user's response before proceeding.
 - Task/Subagent/Parallel: run sequentially in main thread; use multi_tool_use.parallel for tool calls
 - TodoWrite/TodoRead: use file-based todos in todos/ with file-todos skill
 - Skill: open the referenced SKILL.md and follow it