Bug

cargo build -p zeph-llm --features candle succeeds, but cargo nextest run -p zeph-llm --features candle --lib fails with:

error[E0433]: failed to resolve: use of undeclared type `MessageMetadata`

The candle feature depends on MessageMetadata which is gated behind another feature flag not included when building candle alone.

Impact

• Cannot run zeph-llm unit tests with --features candle in isolation
• CI runs with --features full which includes all features, masking this bug
• Prevents targeted candle-only test runs for classifier development (feat(classifiers): replace regex heuristics with Candle-backed lightweight classifiers #2185)

Reproduction

cargo nextest run -p zeph-llm --features candle --lib
# -> error[E0433]: failed to resolve: use of undeclared type MessageMetadata

Works fine with:

cargo nextest run --workspace --features full --lib  # all 6554 pass

Fix

Identify which module declares MessageMetadata and ensure its feature gate is a dependency of the candle feature, or remove the dependency from candle-scoped test code.