`--bg` feature gate disabled on Windows, enabled on macOS for same account + version

claude --bg works on macOS but fails on Windows with the same Anthropic account and same Claude Code version. Suggests platform-gated rollout or a Windows-specific flag-fetch bug.

Feedback ID: 412130e2-80b8-4453-8726-e2010c2e4973

Environment

• Claude Code: 2.1.139 (same on both machines)
• Account: same Anthropic account on both
• macOS: works
• Windows: 11 Home, PowerShell 7.6.1

Repro

claude --bg

claude agents

Expected: launches in background mode (as on macOS).

Actual (Windows only):

'--bg' is not enabled. If this is unexpected, retry in a moment.

claude agents currently returns the old agents on windows:

<img width="547" height="878" alt="Image" src="https://github.com/user-attachments/assets/91232a9a-d181-40e0-8d03-9033f76030ed" />

Retrying does not help. claude itself work fine, so the CLI is otherwise healthy.
/goals is working (another feature that was implemented in this version)
something specific to the agents feature for windows.

Rules out

• Account mismatch — same account on both
• Version mismatch — same version on both
• Transient flag fetch — retry doesn't resolve it