feat(shared): add plugin-identity constants for oh-my-openagent rename

- Add plugin-identity.ts with 7 constants (PLUGIN_NAME, LEGACY_PLUGIN_NAME, etc.)
- Add plugin-identity.test.ts with TDD tests
- Update barrel export in index.ts
- Add oh-my-openagent.schema.json for dual schema support
- Update build-schema.ts to output both schemas

Wave 1 of rename-openagent plan complete.

script/build-schema.ts

@@ -3,15 +3,30 @@ import { createOhMyOpenCodeJsonSchema } from "./build-schema-document"
 
 const SCHEMA_OUTPUT_PATH = "assets/oh-my-opencode.schema.json"
 const DIST_SCHEMA_OUTPUT_PATH = "dist/oh-my-opencode.schema.json"
+const OPENAGENT_SCHEMA_OUTPUT_PATH = "assets/oh-my-openagent.schema.json"
+const OPENAGENT_DIST_SCHEMA_OUTPUT_PATH = "dist/oh-my-openagent.schema.json"
 
 async function main() {
   console.log("Generating JSON Schema...")
 
   const finalSchema = createOhMyOpenCodeJsonSchema()
+
+  // oh-my-opencode schema (backward compatibility)
   await Bun.write(SCHEMA_OUTPUT_PATH, JSON.stringify(finalSchema, null, 2))
   await Bun.write(DIST_SCHEMA_OUTPUT_PATH, JSON.stringify(finalSchema, null, 2))
 
+  // oh-my-openagent schema (new name)
+  const openAgentSchema = {
+    ...finalSchema,
+    $id: "https://raw.githubusercontent.com/code-yeongyu/oh-my-openagent/dev/assets/oh-my-openagent.schema.json",
+    title: "Oh My OpenAgent Configuration",
+    description: "Configuration schema for oh-my-openagent plugin",
+  }
+  await Bun.write(OPENAGENT_SCHEMA_OUTPUT_PATH, JSON.stringify(openAgentSchema, null, 2))
+  await Bun.write(OPENAGENT_DIST_SCHEMA_OUTPUT_PATH, JSON.stringify(openAgentSchema, null, 2))
+
   console.log(`✓ JSON Schema generated: ${SCHEMA_OUTPUT_PATH}`)
+  console.log(`✓ JSON Schema generated: ${OPENAGENT_SCHEMA_OUTPUT_PATH}`)
 }
 
 main()