task: implement sdk runner

packages/sdk/README.md

@@ -0,0 +1,27 @@
+# @oh-my-openagent/sdk
+
+Programmatic runner for starting or attaching to an OpenCode server, running oh-my-openagent sessions, and consuming normalized lifecycle events.
+
+## `run()`
+
+```ts
+import { createOmoRunner } from "@oh-my-openagent/sdk"
+
+const runner = createOmoRunner({ directory: process.cwd(), agent: "prometheus" })
+const result = await runner.run("Plan the next release")
+await runner.close()
+```
+
+## `stream()`
+
+```ts
+import { createOmoRunner } from "@oh-my-openagent/sdk"
+
+const runner = createOmoRunner({ directory: process.cwd() })
+
+for await (const event of runner.stream("Investigate the build failure")) {
+  console.log(event.type)
+}
+
+await runner.close()
+```