fix: cleanup for plugin submission (tasks 9-13)

- Remove unused vault.delete() method in favor of trashFile()
- Replace \x00-\x1F with \u0000-\u001F for clearer regex syntax
- Verify no unused imports, variables, or scoping issues

All cleanup tasks verified with tsc --noUnusedLocals --noUnusedParameters

src/adapters/vault-adapter.ts

@@ -43,10 +43,6 @@ export class VaultAdapter implements IVaultAdapter {
 		await this.vault.modify(file, data);
 	}
 
-	async delete(file: TAbstractFile): Promise<void> {
-		await this.vault.delete(file);
-	}
-
 	async trash(file: TAbstractFile, system: boolean): Promise<void> {
 		await this.vault.trash(file, system);
 	}