Add Codex superpowers integration

- Single unified script: superpowers-codex with bootstrap/use-skill/find-skills commands
- Cross-platform Node.js implementation (works on Windows, macOS, Linux)
- Namespaced skills: superpowers:skill-name for superpowers, skill-name for personal
- Personal skills override superpowers skills when names match
- Clean skill display: shows name/description without raw frontmatter
- Helpful context: shows supporting files directory for each skill
- Tool mapping for Codex: TodoWrite→update_plan, subagents→manual fallback, etc.
- Updated terminology: "Superpowers skills" instead of "Core skills"
- Bootstrap integration with AGENTS.md for automatic startup
- Installation guide and bootstrap instructions specific to Codex

codex/INSTALL.md

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+# Installing Superpowers for Codex
+
+Quick setup to enable superpowers skills in Codex.
+
+## Installation
+
+1. **Clone superpowers repository**:
+   ```bash
+   mkdir -p ~/.codex/superpowers
+   cd ~/.codex/superpowers
+   git clone https://github.com/obra/superpowers.git .
+   ```
+
+2. **Create personal skills directory**:
+   ```bash
+   mkdir -p ~/.codex/skills
+   ```
+
+3. **Update ~/.codex/AGENTS.md** to include this superpowers section:
+   ```markdown
+   ## Superpowers System
+
+   <EXTREMELY_IMPORTANT>
+   You have superpowers.
+
+   **RIGHT NOW, immediately run the bootstrap script:**
+
+   ```bash
+   ~/.codex/superpowers/scripts/superpowers-codex bootstrap
+   ```
+
+   This single command will:
+   - Show you the complete bootstrap instructions
+   - List all available skills
+   - Auto-load the using-superpowers skill
+
+   **Tool paths for ongoing use:**
+   - superpowers-codex: ~/.codex/superpowers/scripts/superpowers-codex
+
+   **Critical Rules:**
+   - Before ANY task, review the skills list (already shown in bootstrap)
+   - If a relevant skill exists, you MUST use superpowers-codex use-skill to load it
+   - Announce: "I've read the [Skill Name] skill and I'm using it to [purpose]"
+   - Skills with checklists require update_plan todos for each item
+   - NEVER skip mandatory workflows (brainstorming before coding, TDD, systematic debugging)
+
+   **Skills location:**
+   - Superpowers skills: ~/.codex/superpowers/skills/
+   - Personal skills: ~/.codex/skills/ (override superpowers when names match)
+
+   IF A SKILL APPLIES TO YOUR TASK, YOU DO NOT HAVE A CHOICE. YOU MUST USE IT.
+   </EXTREMELY_IMPORTANT>
+   ```
+
+## Verification
+
+Test the installation:
+```bash
+~/.codex/superpowers/scripts/superpowers-codex bootstrap
+```
+
+You should see skill listings and bootstrap instructions. The system is now ready for use.

codex/superpowers-bootstrap.md

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+# Superpowers Bootstrap for Codex
+
+<EXTREMELY_IMPORTANT>
+You have superpowers.
+
+**Tool for running skills:**
+- `~/.codex/superpowers/scripts/superpowers-codex use-skill <skill-name>`
+
+**Tool Mapping for Codex:**
+When skills reference tools you don't have, substitute your equivalent tools:
+- `TodoWrite` → `update_plan` (your planning/task tracking tool)
+- `Task` tool with subagents → Tell the user that subagents aren't available in Codex yet and you'll do the work the subagent would do
+- `Skill` tool → `superpowers-codex use-skill` command (already available)
+- `Read`, `Write`, `Edit`, `Bash` → Use your native tools with similar functions
+
+**Skills naming:**
+- Superpowers skills: `superpowers:skill-name` (from ~/.codex/superpowers/skills/)
+- Personal skills: `skill-name` (from ~/.codex/skills/)
+- Personal skills override superpowers skills when names match
+
+**Critical Rules:**
+- Before ANY task, check the skills list shown below
+- If a relevant skill exists, you MUST use `superpowers-codex use-skill` to load it
+- Announce: "I've read the [Skill Name] skill and I'm using it to [purpose]"
+- Skills with checklists require `update_plan` todos for each item
+- NEVER skip mandatory workflows (brainstorming before coding, TDD, systematic debugging)
+
+IF A SKILL APPLIES TO YOUR TASK, YOU DO NOT HAVE A CHOICE. YOU MUST USE IT.
+</EXTREMELY_IMPORTANT>