minor tweaks

src/pipeline.rs

@@ -4850,9 +4850,11 @@ fn derive_offsets(
         match chain_and_vote(&anchors, hv, target_idx) {
             Some((pred, conf)) if conf >= 80 => {
                 gd.set_offset(f.name.clone(), pred as i64);
-                // The class the slot was chained THROUGH — the only one that makes the index meaningful.
-                // Recorded here rather than reconstructed later from the name, which would be a different
-                // (and sometimes wrong) fact: a base-declared method sits in a derived class's vtable.
+                // The class whose vtable this slot indexes — half the locator, since an index alone locates
+                // nothing. It is `class_of(f.name)`: `vtable_offset_timelines` builds `VtFunc::class` that
+                // way and both `hops` and `bv.fps` are keyed by it, so the class the chain walked and the
+                // class in the name are one fact, not two. Emitting it saves the consumer a name split; it
+                // does not add information the name lacks.
                 gd.set_class(f.name.clone(), f.class.clone());
                 off_ok += 1;
             }