Code output still renders as white text on light terminal backgrounds (regression of #704)

This is a follow-up to #704 (which was itself a follow-up to #617) — the issue has regressed.

Code output in the terminal is still rendered as white text, making it unreadable on light/white terminal backgrounds. The content is visible when opening the session in VS Code, but not in the terminal itself.

### Environment
| Field | Value |
|-------|-------|
| CLI Version | 0.6.0 |
| Platform | darwin arm64 |
| macOS Version | 26.4.1 |
| macOS Appearance | Light |
| Shell | zsh |
| Node | v19.7.0 |

### Terminal
| Field | Value |
|-------|-------|
| TERM | xterm-256color |
| TERM_PROGRAM | Apple_Terminal |
| TERM_PROGRAM_VERSION | 470 |
| COLORTERM | truecolor |

---

### Metadata

| Field | Value |
|-------|-------|
| CLI Version | 0.6.0 |
| Platform | darwin |
| Architecture | arm64 |
| OS Release | 25.4.0 |
| Category | bug |
| Working Directory | data-warehouse-etl-dbt |
| Session ID | ses_245204e37ffeOGp62boUhBF1Jj |