Assert specific click.UsageError in package manager auto-detection test

[Copilot]

The test_context_package_manager_none test was asserting a broad Exception type instead of the specific click.UsageError raised by Context.package_manager when no lock files are found.

Changes

• Import click module in tests/test_main.py
• Replace pytest.raises(Exception) with pytest.raises(click.UsageError, match="No uv.lock or poetry.lock found")

This prevents the test from masking unrelated failures and validates the exact error message.

# Before
with pytest.raises(Exception):
    ctx.package_manager

# After
with pytest.raises(click.UsageError, match="No uv.lock or poetry.lock found"):
    ctx.package_manager

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