[Bug] @file directive only accepts root-level filenames

Bug Description
@file has stopped working correctly. I can only specify root level file names.

Environment Info

• Platform: darwin
• Terminal: vscode
• Version: 2.1.9
• Feedback ID: e15b38f6-c055-4f7d-b8d9-1160443b908e

Errors

[{"error":"Error\n    at Sk (/$bunfs/root/claude:38:1144)\n    at <anonymous> (/$bunfs/root/claude:43:10093)\n    at emit (node:events:92:22)\n    at endReadableNT (internal:streams/readable:861:50)\n    at processTicksAndRejections (native:7:39)\n    at request (/$bunfs/root/claude:45:2149)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-01-16T16:40:20.814Z"},{"error":"Error\n    at Sk (/$bunfs/root/claude:38:1144)\n    at <anonymous> (/$bunfs/root/claude:43:10093)\n    at emit (node:events:92:22)\n    at endReadableNT (internal:streams/readable:861:50)\n    at processTicksAndRejections (native:7:39)\n    at request (/$bunfs/root/claude:45:2149)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-01-16T16:40:20.909Z"}]