Make Codex create-plan use explicit superpowers commands

docs/CREATE-PLAN.md

@@ -10,6 +10,8 @@ Create structured implementation plans with milestone and story tracking.
 - Required dependencies:
   - `brainstorming`
   - `writing-plans`
+- For Codex, Superpowers runner must exist at:
+  - `~/.codex/superpowers/.codex/superpowers-codex`
 
 If dependencies are missing, stop and return:
 
@@ -51,6 +53,21 @@ Verify Superpowers dependencies exist in your agent skills root:
 - `.../skills/brainstorming/SKILL.md`
 - `.../skills/writing-plans/SKILL.md`
 
+For Codex, verify runner:
+
+```bash
+test -x ~/.codex/superpowers/.codex/superpowers-codex
+~/.codex/superpowers/.codex/superpowers-codex --help
+```
+
+Codex must invoke these explicit commands during planning:
+
+```bash
+~/.codex/superpowers/.codex/superpowers-codex bootstrap
+~/.codex/superpowers/.codex/superpowers-codex use-skill brainstorming
+~/.codex/superpowers/.codex/superpowers-codex use-skill writing-plans
+```
+
 ## Key Behavior
 
 - Creates plans under `ai_plan/YYYY-MM-DD-<short-title>/`.