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.

src/shared/plugin-identity.test.ts

@@ -1,48 +1,89 @@
 import { describe, it, expect } from "bun:test"
-import { PLUGIN_NAME, CONFIG_BASENAME, LOG_FILENAME, CACHE_DIR_NAME } from "./plugin-identity"
+import {
+  PLUGIN_NAME,
+  LEGACY_PLUGIN_NAME,
+  CONFIG_BASENAME,
+  LEGACY_CONFIG_BASENAME,
+  LOG_FILENAME,
+  CACHE_DIR_NAME,
+  LEGACY_CACHE_DIR_NAME,
+} from "./plugin-identity"
 
 describe("plugin-identity constants", () => {
   describe("PLUGIN_NAME", () => {
+    it("equals oh-my-openagent", () => {
+      // given
+
+      // when
+
+      // then
+      expect(PLUGIN_NAME).toBe("oh-my-openagent")
+    })
+  })
+
+  describe("LEGACY_PLUGIN_NAME", () => {
     it("equals oh-my-opencode", () => {
       // given
 
       // when
 
       // then
-      expect(PLUGIN_NAME).toBe("oh-my-opencode")
+      expect(LEGACY_PLUGIN_NAME).toBe("oh-my-opencode")
     })
   })
 
   describe("CONFIG_BASENAME", () => {
+    it("equals oh-my-openagent", () => {
+      // given
+
+      // when
+
+      // then
+      expect(CONFIG_BASENAME).toBe("oh-my-openagent")
+    })
+  })
+
+  describe("LEGACY_CONFIG_BASENAME", () => {
     it("equals oh-my-opencode", () => {
       // given
 
       // when
 
       // then
-      expect(CONFIG_BASENAME).toBe("oh-my-opencode")
+      expect(LEGACY_CONFIG_BASENAME).toBe("oh-my-opencode")
     })
   })
 
   describe("LOG_FILENAME", () => {
-    it("equals oh-my-opencode.log", () => {
+    it("equals oh-my-openagent.log", () => {
       // given
 
       // when
 
       // then
-      expect(LOG_FILENAME).toBe("oh-my-opencode.log")
+      expect(LOG_FILENAME).toBe("oh-my-openagent.log")
     })
   })
 
   describe("CACHE_DIR_NAME", () => {
+    it("equals oh-my-openagent", () => {
+      // given
+
+      // when
+
+      // then
+      expect(CACHE_DIR_NAME).toBe("oh-my-openagent")
+    })
+  })
+
+  describe("LEGACY_CACHE_DIR_NAME", () => {
     it("equals oh-my-opencode", () => {
       // given
 
       // when
 
       // then
-      expect(CACHE_DIR_NAME).toBe("oh-my-opencode")
+      expect(LEGACY_CACHE_DIR_NAME).toBe("oh-my-opencode")
     })
   })
 })

src/shared/plugin-identity.ts

@@ -1,5 +1,7 @@
-export const PLUGIN_NAME = "oh-my-opencode"
-export const LEGACY_PLUGIN_NAME = "oh-my-openagent"
-export const CONFIG_BASENAME = "oh-my-opencode"
-export const LOG_FILENAME = "oh-my-opencode.log"
-export const CACHE_DIR_NAME = "oh-my-opencode"
+export const PLUGIN_NAME = "oh-my-openagent"
+export const LEGACY_PLUGIN_NAME = "oh-my-opencode"
+export const CONFIG_BASENAME = "oh-my-openagent"
+export const LEGACY_CONFIG_BASENAME = "oh-my-opencode"
+export const LOG_FILENAME = "oh-my-openagent.log"
+export const CACHE_DIR_NAME = "oh-my-openagent"
+export const LEGACY_CACHE_DIR_NAME = "oh-my-opencode"