bug: fix(credentials): Windows credentials file unreadable after setup — EPERM on read

[aythin]

What happened?

After running testsprite setup, all subsequent commands fail with:

Error: EPERM: operation not permitted, open '~/.testsprite/credentials'

The file is created successfully by setup, but becomes immediately unreadable.

Steps to reproduce

1. testsprite setup --from-env --yes
2. testsprite doctor

Relevant output

Error: EPERM: operation not permitted, open 'C:\Users\<username>\.testsprite\credentials'

CLI version

0.4.0

Node.js version

v24.14.0

Operating system

Windows 11 Pro

Confirmations

• I have searched existing issues and this is not a duplicate.
• I am on the latest published version, or have noted why I cannot upgrade.
• I have removed any secrets (API keys, credentials, private URLs) from this report.

[aythin]

/assign

[testsprite-hob]

Assigned to @aythin. Thanks for taking this on. (2 more slots available.)

Your open assigned issues (1/3):
(none)