Normalize Git and PTY adapter errors across services

- Use domain errors directly in GitManager tests (`GitHubCliError`, `TextGenerationError`)
- Remove fixture-only GH error normalization in test scaffolding
- Introduce shared `PtyAdapterInitializationError` and use it in NodePTY adapter init
2742cd8a0cJulius Marminge committed on 2/27/2026, 2:47:40 AMparent79affb0
2 files changedLine totals unavailable