VSCode extension @ file picker does not index .py files

Description

The @ file reference autocomplete in the VSCode integrated extension does not show .py files. Other file types (.ts, .tsx, .json, etc.) appear correctly. The CLI extension indexes .py files without issue.

Steps to reproduce

1. Open a Python project in VSCode with the Claude Code extension
2. Start a Claude Code conversation in the VSCode panel
3. Type @ and search for any .py file by name
4. No .py files appear in the autocomplete suggestions

Expected behavior

.py files should appear in the @ file picker autocomplete, the same as they do in the CLI.

Environment

• Claude Code VSCode extension (panel mode)
• Linux (Ubuntu, kernel 6.17)
• Project contains ~493 .py files
• .claudeignore and .gitignore do not exclude .py files
• No files.exclude or search.exclude VSCode settings targeting .py

Additional context

• Verified .claudeignore, .gitignore, VSCode workspace settings, VSCode global user settings, and Claude Code settings — none exclude .py files
• The same project works correctly with @ references for .py files in the Claude Code CLI
• Only .py files are affected; all other file types index correctly