feat(openai): plugin for ChatGPT and Codex in the shared skills layout

.release-please-manifest.json

@@ -1,3 +1,4 @@
 {
-  "dist/copilot": "0.1.1"
+  "dist/copilot": "0.1.1",
+  "dist/openai": "0.1.8"
 }

CONTRIBUTING.md

@@ -14,10 +14,12 @@ platforms/<host>/
   skills/<skill>/<slot>.md   the host's text for a {{> slot}} in that skill
   readme/setup.md            the host's Setup section of its README (readme/more.md: optional extra sections)
   overrides.lock             whole-file overrides and the shared version each was copied from (only once one exists)
+  scripts/                   the host's own tooling, never shipped; validate.mjs and package.sh are run by
+                             npm run validate and npm run package -- <host>, the rest by the host itself
   everything else            the host's manifests, …, copied into dist/<host>/ ({{version}} comes from release-please)
 dist/<host>/                 GENERATED: the plugin the host installs, or a code host's files
 .github/plugin/marketplace.json  Copilot's marketplace catalog (see below)
-scripts/                     render, validate, override, new-host, mirror, test
+scripts/                     render, validate, override, new-host, package, mirror, test
 ```
 
 ### Marketplace catalogs

README.md

@@ -9,6 +9,7 @@ Each host's guide covers installing the plugin and signing in to Zenrows. You si
 <!-- hosts:start (generated by npm run render from platforms/; don't edit) -->
 | Host | Setup guide |
 |---|---|
+| ChatGPT and Codex | [dist/openai/README.md](dist/openai/README.md) |
 | GitHub Copilot | [dist/copilot/README.md](dist/copilot/README.md) |
 <!-- hosts:end -->