fix: allow # in filenames for @file references (upstream anomalyco#12424)

Author: shuv1337

packages/opencode/src/config/markdown.ts

@@ -3,7 +3,8 @@ import matter from "gray-matter"
 import { z } from "zod"
 
 export namespace ConfigMarkdown {
-  export const FILE_REGEX = /(?<![\w`])@(\.?[^\s`,.#]*(?:\.[^\s`,.#]+)*)(?:#L(\d+)(?:-(\d+))?)?/g
+  export const FILE_REGEX =
+    /(?<![\w`])@(\.?(?:[^\s`,.#]|#(?!L\d))*(?:\.(?:[^\s`,.#]|#(?!L\d))+)*)(?:#L(\d+)(?:-(\d+))?)?/g
   export const SHELL_REGEX = /!`([^`]+)`/g
 
   export function files(template: string) {