fix(ovsm): remove unused Error import in test file

Removes unused import warning in verify_no_silent_failures.rs test.

## Changes
- Removed unused `Error` import from use statement
- Fixes: `-D unused-imports` clippy warning

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: 0xrinegade

crates/ovsm/tests/verify_no_silent_failures.rs

@@ -3,7 +3,7 @@
 //! This test suite would have FAILED before v1.1.0 and now PASSES.
 //! It verifies that all previously-silent features now either work or error loudly.
 
-use ovsm::{Error, Evaluator, Parser, Scanner, Value};
+use ovsm::{Evaluator, Parser, Scanner, Value};
 
 /// Helper function to execute OVSM code
 fn execute(code: &str) -> Result<Value, Box<dyn std::error::Error>> {