[BUG] Remote Control "not yet enabled" on Max 20x — server-side feature flag regression (tengu_ccr_bridge: false)

Bug Description

claude remote-control returns:

Error: Remote Control is not yet enabled for your account.

This feature previously worked on this account and stopped working without any local changes. Other gated features are also unavailable despite an active Max 20x subscription.

Environment

• Claude Code version: 2.1.76
• Plan: Max 20x (active, renewing via Stripe)
• OS: macOS
• Auth: OAuth via claude.ai (/login)
• Account email: ken@sscc.io

Root Cause Analysis

After extensive debugging:

1. hasAvailableSubscription: false in ~/.claude.json despite active Max 20x plan. The /login flow does not refresh this flag to true.
2. tengu_ccr_bridge: false — this is the only GrowthBook feature flag returning false out of all cached flags. Server-side override persists after cache clear + re-auth.
3. Manually setting hasAvailableSubscription: true and clearing cachedGrowthBookFeatures causes GrowthBook to re-fetch, but tengu_ccr_bridge still returns false from the server.
4. No telemetry-suppressing env vars set (CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC, DISABLE_TELEMETRY both unset).

Steps to Reproduce

1. claude auth logout
2. claude auth login (completes successfully)
3. claude remote-control → Error: Remote Control is not yet enabled for your account.

What I Tried

• Logged out and back in multiple times
• Cleared cachedGrowthBookFeatures and cachedStatsigGates from ~/.claude.json
• Manually set hasAvailableSubscription: true — GrowthBook still returns tengu_ccr_bridge: false
• Confirmed billing is active at claude.ai/settings/billing

Expected Behavior

Remote Control should be available for Max plan subscribers per https://code.claude.com/docs/en/remote-control. This previously worked on this account.

Related Issues

This appears to be the same server-side feature flag gating issue reported in:

• #33119 (Max plan, resolved via env var — not applicable here)
• #28816, #28884, #29037, #29185, #29192, #29449, #30242, #31606

The common thread across all of these is that the GrowthBook feature flag evaluation is incorrectly gating valid Max/Pro subscribers out of Remote Control.