refactor: rename oh-my-opencode files to oh-my-openagent via git mv

- git mv bin/oh-my-opencode.js -> bin/oh-my-openagent.js
- git mv src/config/schema/oh-my-opencode-config.ts -> oh-my-openagent-config.ts
- Update import path in src/config/schema.ts
- Update self-reference comment in bin file

Wave 2 Task 4 complete.

bin/oh-my-openagent.js

@@ -1,5 +1,5 @@
 #!/usr/bin/env node
-// bin/oh-my-opencode.js
+// bin/oh-my-openagent.js
 // Wrapper script that detects platform and spawns the correct binary
 
 import { spawnSync } from "node:child_process";

src/config/schema.ts

@@ -14,7 +14,7 @@ export * from "./schema/git-env-prefix"
 export * from "./schema/git-master"
 export * from "./schema/hooks"
 export * from "./schema/notification"
-export * from "./schema/oh-my-opencode-config"
+export * from "./schema/oh-my-openagent-config"
 export * from "./schema/ralph-loop"
 export * from "./schema/runtime-fallback"
 export * from "./schema/skills"