feat: standardize request_user_input schema across all codex skills and add config reminder

- Update all 68 .codex/skills files to use correct request_user_input schema
  (header, id, question, options with label/description)
- Remove deprecated multiSelect, type, value, prompt fields
- Add mandatory confirmation gates to planning-only skills
- Add Codex config.toml reminder to ccw install CLI
- Add Codex configuration section to README.md and README_CN.md

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

.codex/skills/spec-generator/phases/04-architecture.md

@@ -154,14 +154,14 @@ CONSTRAINTS: Be genuinely critical, not just validating. Focus on actionable imp
 if (!autoMode) {
   // Present ADRs with review feedback to user
   // For each ADR where review raised concerns:
-  AskUserQuestion({
+  request_user_input({
     questions: [
       {
-        question: "Architecture review raised concerns. How should we proceed?",
         header: "ADR Review",
-        multiSelect: false,
+        id: "adr_review",
+        question: "Architecture review raised concerns. How should we proceed?",
         options: [
-          { label: "Accept as-is", description: "Architecture is sound, proceed" },
+          { label: "Accept as-is(Recommended)", description: "Architecture is sound, proceed" },
           { label: "Incorporate feedback", description: "Adjust ADRs based on review" },
           { label: "Simplify", description: "Reduce complexity, fewer components" }
         ]