refactor: rename OhMyOpenCode types to OhMyOpenAgent and centralize PACKAGE_NAME

- Rename all PascalCase types: OhMyOpenCodePlugin → OhMyOpenAgentPlugin, etc.
- 231 OhMyOpenAgent references across ~60 files
- Centralize 4 PACKAGE_NAME constants to import from plugin-identity.ts
- Update src/plugin-config.ts to use CONFIG_BASENAME from plugin-identity

Wave 3 Tasks 5 & 6 complete.

src/hooks/anthropic-context-window-limit-recovery/executor.ts

@@ -1,5 +1,5 @@
 import type { AutoCompactState } from "./types";
-import type { OhMyOpenCodeConfig } from "../../config";
+import type { OhMyOpenAgentConfig } from "../../config";
 import type { ExperimentalConfig } from "../../config";
 import { TRUNCATE_CONFIG } from "./types";
 
@@ -18,7 +18,7 @@ export async function executeCompact(
   autoCompactState: AutoCompactState,
   client: Client,
   directory: string,
-  pluginConfig: OhMyOpenCodeConfig,
+  pluginConfig: OhMyOpenAgentConfig,
   _experimental?: ExperimentalConfig
 ): Promise<void> {
   void _experimental