/usage command shows 'only available for subscription plans' on Claude Max

Bug Description

The /usage command incorrectly shows "only available for subscription plans" even when running on a Claude Max subscription.

Environment

• Claude Code version: v2.1.101
• Plan: Claude Max (Opus 4.6 with 1M context)
• OS: macOS (Darwin 25.3.0)

Steps to Reproduce

1. Open Claude Code with Claude Max subscription
2. Run /usage

Expected Behavior

The usage dialog should display current usage information for the Max plan.

Actual Behavior

The dialog opens but shows:

/usage is only available for subscription plans.

Evidence

Startup screen confirms Max plan:

 ▐▛███▜▌   Claude Code v2.1.101
▝▜█████▛▘  Opus 4.6 (1M context) with high effort · Claude Max
  ▘▘ ▝▝

Yet /usage denies access as if no subscription is active.