Fix 3 compile errors: rtx-metal (Linux cfg), rtx-onnx (ort API), rtx-fusion (edition)

- rtx-metal: fix MetalError import in sparse/conversion.rs non-macOS stub
- rtx-onnx: update session.rs and tensor_bridge.rs for ort 2.x API changes
- rtx-fusion: fix Cargo.toml package name
- rtx-hub: fix discovery.rs type mismatch
- Full workspace (80+ crates) now compiles clean on Linux

crates/production/rtx-hub/src/discovery.rs

@@ -616,8 +616,11 @@ impl ModelMetrics {
             .iter()
             .filter(|(date_str, _)| {
                 if let Ok(date) = chrono::NaiveDate::parse_from_str(date_str, "%Y-%m-%d") {
-                    let datetime = date.and_hms_opt(0, 0, 0).unwrap();
-                    datetime.and_utc() >= cutoff
+                    if let Some(datetime) = date.and_hms_opt(0, 0, 0) {
+                        datetime.and_utc() >= cutoff
+                    } else {
+                        false
+                    }
                 } else {
                     false
                 }