Add skill logo, Cursor plugin config, and Codex manifest

Bring the repo to parity with the SwiftUI-Agent-Skill reference:
- Add assets/logo.svg skill icon
- Add .cursor-plugin/plugin.json for Cursor marketplace submission
- Add agents/openai.yaml for Codex / OpenAI-compatible tools
- Update .claude-plugin/marketplace.json schema URL to full GitHub raw URL
- Update README with Cursor and Codex installation options and skill structure tree

.claude-plugin/marketplace.json

@@ -1,5 +1,5 @@
 {
-  "$schema": "https://anthropic.com/claude-code/marketplace.schema.json",
+  "$schema": "https://raw.githubusercontent.com/anthropics/claude-code/refs/heads/main/marketplace/marketplace.schema.json",
   "name": "xcode-build-skills",
   "version": "1.0.0",
   "owner": {

.cursor-plugin/plugin.json

@@ -0,0 +1,34 @@
+{
+  "name": "xcode-build-skills",
+  "version": "1.0.0",
+  "description": "A multi-skill plugin for benchmarking and optimizing Xcode builds, compile hotspots, project settings, and Swift Package Manager dependency overhead.",
+  "author": {
+    "name": "Antoine van der Lee",
+    "email": "contact@avanderlee.com"
+  },
+  "repository": "https://github.com/AvdLee/Xcode-Build-Optimization-Agent-Skill",
+  "license": "MIT",
+  "logo": "assets/logo.svg",
+  "keywords": [
+    "xcode",
+    "builds",
+    "incremental-builds",
+    "clean-builds",
+    "swift",
+    "ios",
+    "macos",
+    "spm",
+    "benchmarking",
+    "compilation",
+    "project-settings",
+    "explicit-modules"
+  ],
+  "skills": [
+    "skills/xcode-build-benchmark",
+    "skills/xcode-compilation-analyzer",
+    "skills/xcode-project-analyzer",
+    "skills/spm-build-analysis",
+    "skills/xcode-build-orchestrator",
+    "skills/xcode-build-fixer"
+  ]
+}

README.md

@@ -156,7 +156,23 @@ To enable for everyone in a repository, add to your project configuration:
 }
 ```
 
-### Option C: Manual Install
+### Option C: Cursor Plugin (coming soon)
+
+This repository is packaged for Cursor plugin submission, but the marketplace listing is not live yet.
+
+Once approved, you'll be able to install it from the Cursor Marketplace.
+
+### Option D: Codex / OpenAI-compatible tools
+
+This repository includes an `agents/openai.yaml` manifest. Copy or symlink the skill folders into your Codex skills directory:
+
+```bash
+cp -R skills/ "$CODEX_HOME/skills/"
+```
+
+See [Codex skills documentation](https://developers.openai.com/codex/skills/#where-to-save-skills) for details on where to save skills.
+
+### Option E: Manual Install
 
 1. Clone this repository.
 2. Install or symlink the specific skill folder from `skills/` that you want.
@@ -205,6 +221,13 @@ xcode-build-optimization-agent-skill/
   .claude-plugin/
     marketplace.json
     plugin.json
+  .cursor-plugin/
+    plugin.json
+  agents/
+    openai.yaml
+  assets/
+    logo.svg
+    xcode-build-optimization-banner.jpg
   references/
     benchmark-artifacts.md
     build-optimization-sources.md

agents/openai.yaml

@@ -0,0 +1,32 @@
+name: xcode-build-skills
+version: "1.0.0"
+description: >-
+  A multi-skill plugin for benchmarking and optimizing Xcode builds,
+  compile hotspots, project settings, and Swift Package Manager
+  dependency overhead.
+author:
+  name: Antoine van der Lee
+  email: contact@avanderlee.com
+repository: https://github.com/AvdLee/Xcode-Build-Optimization-Agent-Skill
+license: MIT
+logo: assets/logo.svg
+keywords:
+  - xcode
+  - builds
+  - incremental-builds
+  - clean-builds
+  - swift
+  - ios
+  - macos
+  - spm
+  - benchmarking
+  - compilation
+  - project-settings
+  - explicit-modules
+skills:
+  - skills/xcode-build-benchmark
+  - skills/xcode-compilation-analyzer
+  - skills/xcode-project-analyzer
+  - skills/spm-build-analysis
+  - skills/xcode-build-orchestrator
+  - skills/xcode-build-fixer