feat: configurable instructions (#624)

packages/opencode/src/util/filesystem.ts

@@ -15,4 +15,28 @@ export namespace Filesystem {
     }
     return result
   }
+
+  export async function globUp(pattern: string, start: string, stop?: string) {
+    let current = start
+    const result = []
+    while (true) {
+      try {
+        const glob = new Bun.Glob(pattern)
+        for await (const match of glob.scan({
+          cwd: current,
+          onlyFiles: true,
+          dot: true,
+        })) {
+          result.push(join(current, match))
+        }
+      } catch {
+        // Skip invalid glob patterns
+      }
+      if (stop === current) break
+      const parent = dirname(current)
+      if (parent === current) break
+      current = parent
+    }
+    return result
+  }
 }