chore: import upstream snapshot with attribution

.opencode/INSTALL.md

@@ -0,0 +1,31 @@
+# Installing Compound Engineering for OpenCode
+
+Add Compound Engineering to the `plugin` array in your global or project `opencode.json`:
+
+```json
+{
+  "plugin": ["compound-engineering@git+https://github.com/EveryInc/compound-engineering-plugin.git"]
+}
+```
+
+Restart OpenCode after changing the config. The OpenCode plugin registers the Compound Engineering skills directory directly; no Bun installer or generated skill copy is required.
+
+To pin a release, add a tag. Replace `X.Y.Z` with the release you want — see the [releases page](https://github.com/EveryInc/compound-engineering-plugin/releases) for available tags:
+
+```json
+{
+  "plugin": ["compound-engineering@git+https://github.com/EveryInc/compound-engineering-plugin.git#compound-engineering-vX.Y.Z"]
+}
+```
+
+## Local Development
+
+From this checkout, point OpenCode at the package path:
+
+```json
+{
+  "plugin": ["/path/to/compound-engineering-plugin"]
+}
+```
+
+Restart OpenCode after changing the package source.

.opencode/plugins/compound-engineering.js

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+import path from "path"
+import { fileURLToPath } from "url"
+
+const pluginDir = path.dirname(fileURLToPath(import.meta.url))
+const skillsDir = path.resolve(pluginDir, "../../skills")
+
+export const CompoundEngineeringPlugin = async () => ({
+  config: async (config) => {
+    config.skills = config.skills || {}
+    config.skills.paths = config.skills.paths || []
+    if (!config.skills.paths.includes(skillsDir)) {
+      config.skills.paths.push(skillsDir)
+    }
+  },
+})
+
+export default CompoundEngineeringPlugin