Minimal bug: session.delete doesn't quote cleanup

[WindowsNT]

{"id":"8","jsonrpc":"2.0","method":"session.create","params":{"envValueMode":"direct","model":"gpt-5-mini","requestPermission":true,"streaming":true}}

{"jsonrpc":"2.0","id":"8","result":{"sessionId":"2ed3186c-ffab-4644-ae4d-b8968261f9ad","workspacePath":"C:\\Users\\chour\\.copilot\\session-state\\2ed3186c-ffab-4644-ae4d-b8968261f9ad"}}

and folder 2ed3186c-ffab-4644-ae4d-b8968261f9ad is created in userprofile.copilot\session-state

Later on

{"id":"11","jsonrpc":"2.0","method":"session.delete","params":{"sessionId":"2ed3186c-ffab-4644-ae4d-b8968261f9ad"}}
{"jsonrpc":"2.0","id":"11","result":{"success":true}}

And yet the folder is still there, some leftover files inside