dbt.dbtIntegration: "fusion" fails detection when dbt Fusion is installed as pip package (no Python module)

[fivetran-michikokawamoto]

Environment

• Extension version: 0.61.7
• dbt Fusion: 2.0.0-preview.190
• OS: macOS

Steps to reproduce

1. Install dbt Fusion via pip into a venv (pip install)
2. Set "dbt.dbtIntegration": "fusion" in .vscode/settings.json
3. Open the project in VS Code
4. Detect from terminal results in

python3 -c 'import sys; __import__("dbt"); print("__DBT_DETECT_START__"); print(
sys.executable); print("__DBT_DETECT_END__")'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
    import sys; __import__("dbt"); print("__DBT_DETECT_START__"); print(sys.executable); print("__DBT_DETECT_END__")
                ~~~~~~~~~~^^^^^^^
ModuleNotFoundError: No module named 'dbt'

Expected: Extension detects dbt Fusion binary and initializes successfully

Actual: Extension shows "dbt fusion is not installed" because it runs python3 -c 'import dbt' — which fails since the Fusion pip package installs a binary only, with no importable Python module

Root cause: In fusion mode, the extension should detect the dbt binary directly (e.g. dbt --version) rather than attempting a Python import