Subagent CLI output regression since v2.0.11 (fixed in v2.0.10, broken again)

Description

The terminal renderer issue that was fixed in v2.0.10 with "Rewrote terminal renderer for buttery smooth UI" has regressed in v2.0.11 and remains broken through v2.0.28.

Expected Behavior

When subagents are running, their internal processing should only be partially visible in the CLI output, as implemented in v2.0.10.

Actual Behavior

Since v2.0.11, all internal processing of subagents is output to the terminal, causing:

• Excessive output that overwhelms the terminal
• Occasional freezes/hangs due to the volume of output

Affected Versions

• ✅ v2.0.10: Works correctly
• ❌ v2.0.11 through v2.0.28: All affected (regression)

Steps to Reproduce

1. Launch any subagent
2. Observe the CLI output while the subagent is running
3. Notice that all internal processing details are being printed instead of being suppressed

Additional Context

This appears to be a regression introduced in v2.0.11. The terminal renderer rewrite in v2.0.10 successfully addressed this issue, but something in v2.0.11 or later broke it again.

Environment

• Claude Code versions tested: 2.0.11, 2.0.12, ..., 2.0.28 (all affected)
• Platform: Windows