Cannot scroll up in Windows Terminal while Claude Code is running (regression since 2.1.x / Opus 4.7 release)

Summary

Since the Claude Code release that introduced Opus 4.7 support, scrolling
the terminal scrollback is completely blocked while the Claude Code TUI
is running in Windows Terminal. Mouse wheel, Shift+PageUp, and scrollbar
drag all do nothing. The only way to see earlier output is to exit Claude
Code.

This is a regression — scrolling worked normally in prior versions.

Environment

• Claude Code: 2.1.112
• Windows Terminal: 1.24.10921.0
• OS: Windows 11 Pro for Workstations, build 26200
• Shell: PowerShell / bash via Git for Windows (same behavior in both)

Repro

1. Open Windows Terminal
2. Run claude
3. Produce enough output to require scrollback (any long task)
4. Try to scroll up — mouse wheel, Shift+PageUp, scrollbar drag

Expected

Normal terminal scrollback while the TUI is running, as in prior versions.

Actual

Scroll inputs are ignored. Scrollback is inaccessible until Claude Code exits.

Notes

Ctrl+O in-app transcript viewer is a partial workaround but doesn't
replace being able to scroll the terminal naturally (e.g. to copy older
tool output).