Move Codex tool mapping to progressive disclosure reference file

Addresses Jesse's review feedback on PR #450:
- Move inline routing table from using-superpowers to references/codex-tools.md,
  leveraging Codex's native progressive disclosure for companion files
- Narrow SUBAGENT-STOP from "Do not invoke skills" to "Do not invoke
  superpowers skills" so subagents can still use non-superpowers skills

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

skills/using-superpowers/SKILL.md

@@ -4,7 +4,7 @@ description: Use when starting any conversation - establishes how to find and us
 ---
 
 <SUBAGENT-STOP>
-If you were dispatched as a subagent to execute a specific task, STOP. This skill is not for you. Your dispatch prompt is your instructions. Do not invoke skills. Go execute your task.
+If you were dispatched as a subagent to execute a specific task, STOP. This skill is not for you. Your dispatch prompt is your instructions. Do not invoke superpowers skills. Go execute your task.
 </SUBAGENT-STOP>
 
 <EXTREMELY-IMPORTANT>
@@ -31,16 +31,9 @@ If CLAUDE.md says "don't use TDD" and a skill says "always use TDD," follow CLAU
 
 **In other environments:** Check your platform's documentation for how skills are loaded.
 
-## Dispatching Tasks
+## Platform Adaptation
 
-Skills that dispatch subagent tasks (like `dispatching-parallel-agents`, `subagent-driven-development`) use platform-specific mechanisms. Skill examples use Claude Code syntax — translate to your platform:
-
-| Concept | Claude Code | Codex (`[features] collab = true`) |
-|---------|------------|-----|
-| Dispatch a task | `Task` tool | `spawn_agent` |
-| Parallel tasks | Multiple `Task` calls in one response | Multiple `spawn_agent` calls |
-| Wait for result | Task returns inline | `wait` |
-| End subagent | Task completes automatically | `close_agent` |
+Skills use Claude Code tool names. Non-CC platforms: see `references/codex-tools.md` for tool equivalents.
 
 # Using Skills
 

skills/using-superpowers/references/codex-tools.md

@@ -0,0 +1,25 @@
+# Codex Tool Mapping
+
+Skills use Claude Code tool names. When you encounter these in a skill, use your platform equivalent:
+
+| Skill references | Codex equivalent |
+|-----------------|------------------|
+| `Task` tool (dispatch subagent) | `spawn_agent` |
+| Multiple `Task` calls (parallel) | Multiple `spawn_agent` calls |
+| Task returns result | `wait` |
+| Task completes automatically | `close_agent` to free slot |
+| `TodoWrite` (task tracking) | `update_plan` |
+| `Skill` tool (invoke a skill) | Skills load natively — just follow the instructions |
+| `Read`, `Write`, `Edit` (files) | Use your native file tools |
+| `Bash` (run commands) | Use your native shell tools |
+
+## Subagent dispatch requires collab
+
+Add to your Codex config (`~/.codex/config.toml`):
+
+```toml
+[features]
+collab = true
+```
+
+This enables `spawn_agent`, `wait`, and `close_agent` for skills like `dispatching-parallel-agents` and `subagent-driven-development`.