docs: add Codex CLI integration and MCP planning

.codex/INSTALL.md

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+# Installing Spectacular for Codex
+
+Spectacular enables spec-anchored development with automatic parallel task execution in Codex CLI.
+
+## Prerequisites
+
+- **Codex CLI** installed and working
+- **Node.js** (for running the spectacular-codex CLI tool)
+- **Git** with **git-spice** installed ([installation guide](https://github.com/abhinav/git-spice#installation))
+- **superpowers** plugin installed ([installation guide](https://github.com/obra/superpowers#codex-experimental))
+
+## Installation Steps
+
+### 1. Clone Spectacular
+
+Clone the spectacular repository to `~/.codex/spectacular`:
+
+```bash
+git clone https://github.com/drewritter/spectacular.git ~/.codex/spectacular
+```
+
+Alternatively, if you prefer a different location:
+
+```bash
+git clone https://github.com/drewritter/spectacular.git /path/to/spectacular
+```
+
+### 2. Update AGENTS.md
+
+Add spectacular to your `~/.codex/AGENTS.md` file:
+
+```bash
+# Create ~/.codex/AGENTS.md if it doesn't exist
+mkdir -p ~/.codex
+touch ~/.codex/AGENTS.md
+```
+
+Add the following to `~/.codex/AGENTS.md`:
+
+```markdown
+# Codex Agents Configuration
+
+## Superpowers
+
+run: `~/.codex/superpowers/.codex/superpowers-codex bootstrap`
+
+Follow the output from that command.
+
+## Spectacular
+
+run: `~/.codex/spectacular/.codex/spectacular-codex bootstrap`
+
+Follow the output from that command.
+```
+
+**If using a custom installation path**, update the path accordingly:
+
+```markdown
+## Spectacular
+
+run: `/path/to/spectacular/.codex/spectacular-codex bootstrap`
+
+Follow the output from that command.
+```
+
+### 3. Verify Installation
+
+Test the installation by running the bootstrap command:
+
+```bash
+~/.codex/spectacular/.codex/spectacular-codex bootstrap
+```
+
+You should see:
+- List of available commands (init, spec, plan, execute)
+- List of available skills (decomposing-tasks, writing-specs, etc.)
+- Auto-loaded spectacular:using-spectacular skill
+
+### 4. Initialize Your Project
+
+In your project directory, run:
+
+```bash
+# From Codex CLI
+"Initialize spectacular for this project"
+```
+
+Codex will use the `spectacular:using-spectacular` skill to guide you through:
+- Adding required CLAUDE.md sections
+- Setting up git-spice
+- Configuring development commands
+
+## Using Spectacular in Codex
+
+Once installed, you can use spectacular workflows in Codex:
+
+```bash
+# Start a Codex CLI session in your project
+codex
+
+# Generate feature specification
+"I need a spec for user authentication with magic links"
+
+# Codex will use spectacular:writing-specs skill to guide brainstorming and spec creation
+
+# Once spec exists, decompose into plan
+"Create an implementation plan from specs/abc123-magic-link/spec.md"
+
+# Codex will use spectacular:decomposing-tasks skill to generate plan.md
+
+# Execute the plan
+"Execute the plan at specs/abc123-magic-link/plan.md"
+
+# Codex will use spectacular:executing-parallel-phase and spectacular:executing-sequential-phase
+# skills to orchestrate parallel/sequential execution
+```
+
+## How Spectacular Works in Codex
+
+**At session start:**
+1. Codex reads your `~/.codex/AGENTS.md`
+2. Runs `spectacular-codex bootstrap`
+3. Loads all available commands and skills
+4. Auto-loads the `spectacular:using-spectacular` skill
+
+**During workflows:**
+1. You describe what you want to do
+2. Codex identifies relevant spectacular skills/commands
+3. Codex follows the skill instructions
+4. Work happens in your project using git-spice and worktrees
+
+**Key difference from Claude Code:**
+- In Claude Code: You use `/spectacular:*` slash commands
+- In Codex: You describe what you want, Codex uses spectacular skills automatically
+
+## Available Commands
+
+Run `~/.codex/spectacular/.codex/spectacular-codex find-commands` to see all commands:
+
+- **init** - Initialize spectacular environment
+- **spec** - Generate feature specification
+- **plan** - Decompose spec into executable plan
+- **execute** - Execute plan with parallel orchestration
+
+## Available Skills
+
+Run `~/.codex/spectacular/.codex/spectacular-codex find-skills` to see all skills:
+
+- **using-spectacular** - Mandatory workflow for all spectacular projects
+- **writing-specs** - Feature specification generation
+- **decomposing-tasks** - Task breakdown and phase analysis
+- **executing-parallel-phase** - Parallel task orchestration
+- **executing-sequential-phase** - Sequential task execution
+- **versioning-constitutions** - Constitution evolution workflow
+- **using-git-spice** - Stacked branch management
+- And more...
+
+## Updating Spectacular
+
+To get the latest version:
+
+```bash
+cd ~/.codex/spectacular
+git pull
+```
+
+Codex will notify you at session start if updates are available.
+
+## Troubleshooting
+
+### "spectacular-codex: command not found"
+
+Make sure the script is executable:
+
+```bash
+chmod +x ~/.codex/spectacular/.codex/spectacular-codex
+```
+
+### "Skill not found"
+
+Run the bootstrap command to see available skills:
+
+```bash
+~/.codex/spectacular/.codex/spectacular-codex bootstrap
+```
+
+### "git-spice not found"
+
+Install git-spice following [the official guide](https://github.com/abhinav/git-spice#installation).
+
+### "superpowers not found"
+
+Install superpowers first - spectacular depends on it:
+
+```bash
+git clone https://github.com/obra/superpowers.git ~/.codex/superpowers
+```
+
+Add to `~/.codex/AGENTS.md`:
+
+```markdown
+## Superpowers
+
+run: `~/.codex/superpowers/.codex/superpowers-codex bootstrap`
+
+Follow the output from that command.
+```
+
+## Differences from Claude Code Plugin
+
+If you've used spectacular in Claude Code, note these differences:
+
+| Claude Code | Codex |
+|-------------|-------|
+| Slash commands `/spectacular:*` | Natural language + skills |
+| Plugin in `~/.claude/plugins/` | Scripts in `~/.codex/spectacular/` |
+| Automatic skill loading | Manual skill activation via bootstrap |
+| Subagents via Task tool | (TBD - may need MCP wrapper) |
+
+## Next Steps
+
+1. Read `~/.codex/spectacular/README.md` for methodology overview
+2. Check your project has required CLAUDE.md sections
+3. Try the spec → plan → execute workflow
+4. Review generated branches with `gs log short`
+
+## Support
+
+- Report issues: https://github.com/drewritter/spectacular/issues
+- Documentation: https://github.com/drewritter/spectacular
+- superpowers: https://github.com/obra/superpowers