Hide "Run Python File" button on .pyi stub files

[Copilot]

The editor-title "Run Python File" buttons appear on .pyi stub files, which cannot meaningfully be executed, because .pyi and .py share resourceLangId == python.

Change

• In package.json, tighten the when clauses of both editor/title/run contributions (python.execInTerminal-icon, python.execInDedicatedTerminal) to exclude .pyi:

"when": "resourceLangId == python && resourceExtname != .pyi && !isInDiffEditor && !virtualWorkspace && shellExecutionSupported"

Notes

• Applied as a sensible default rather than a new setting: stub files are type-hint-only and not runnable, so no user-facing configuration is warranted.
• Scoped strictly to the two editor-title run buttons; other Python command contributions (command palette, explorer context, REPL, etc.) are unchanged.