[BUG] v2.1.90 removed full session scroll history in terminal

Bug Description

After updating to Claude Code v2.1.90, full session scrollback is no longer available in the terminal. Previously I could scroll to the top of a session to review the entire conversation history. Now the scroll buffer appears truncated to only ~2-3 pages, and earlier parts of the session are lost.

This makes it impossible to:

• Distinguish between sessions
• Review what questions were asked and what Claude Code replied
• Reference earlier parts of a long conversation

This is a significant regression for daily workflow — the session history was a key part of using Claude Code effectively.

Expected Behavior

Full session history should be scrollable from start to finish, as it was in previous versions (pre-2.1.90).

Environment Info

• Platform: macOS (darwin) → Remote SSH to Linux server (Ubuntu)
• Terminal: iTerm2 (with VS Code Remote SSH)
• Claude Code Version: 2.1.90
• Subscription: Max ($200/mo plan)

Steps to Reproduce

1. Start a Claude Code session via iTerm2 (remote SSH to Linux)
2. Have a moderately long conversation (several back-and-forth exchanges)
3. Try scrolling up to review earlier parts of the session
4. Only ~2-3 pages of history are available — everything before that is gone

Impact

High — this effectively removes the ability to review or reference earlier parts of a session, which was a core part of the workflow in previous versions. Paying Max-tier users rely on this for complex multi-step tasks.