feat: add OpenCode/Codex outputs and update changelog (#104)

* Add OpenCode converter coverage and specs

* Add Codex target support and spec docs

* Generate Codex command skills and refresh spec docs

* Add global Codex install path

* fix: harden plugin path loading and codex descriptions

* feat: ensure codex agents block on convert/install

* docs: clarify target branch usage for review

* chore: prep npm package metadata and release notes

* docs: mention opencode and codex in changelog

* docs: update CLI usage and remove stale todos

* feat: install from GitHub with global outputs

tests/fixtures/sample-plugin/.claude-plugin/plugin.json

@@ -0,0 +1,30 @@
+{
+  "name": "compound-engineering",
+  "version": "2.27.0",
+  "description": "Fixture aligned with the Compound Engineering plugin",
+  "author": {
+    "name": "Kieran Klaassen",
+    "email": "kieran@every.to",
+    "url": "https://github.com/kieranklaassen"
+  },
+  "homepage": "https://every.to/source-code/my-ai-had-already-fixed-the-code-before-i-saw-it",
+  "repository": "https://github.com/EveryInc/compound-engineering-plugin",
+  "license": "MIT",
+  "keywords": [
+    "compound-engineering",
+    "workflow-automation",
+    "code-review",
+    "agents"
+  ],
+  "mcpServers": {
+    "context7": {
+      "type": "http",
+      "url": "https://mcp.context7.com/mcp"
+    },
+    "local-tooling": {
+      "type": "stdio",
+      "command": "echo",
+      "args": ["fixture"]
+    }
+  }
+}