lower: refuse role fills the frame does not name and referents no role mentions; header states what is and is not rendered (Soul pass on 3d851bf)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

crates/weksa/src/lower.rs

@@ -2,9 +2,11 @@
 //! fixed table keyed by inventory ids. It renders predications, referents and the
 //! speech act, and nothing else: no style, no model, no corpus text. It takes a
 //! [`LoweringInput`], so it cannot see the trace or the corpus item. A packet
-//! carrying anything it does not render is refused, because rendering part of a
-//! meaning would assert a different one (`polarity: negative` dropped says the
-//! opposite).
+//! carrying a feature, relation, extension, role fill or referent it does not
+//! render is refused, because rendering part of a meaning would assert a different
+//! one (`polarity: negative` dropped says the opposite). Context, kind and
+//! constraints steer delivery and are not rendered; the concept of a predication
+//! must resolve but the frame owns the verb.
 //!
 //! The table is a temporary owner. Each row speaks for an inventory entry and
 //! names the gloss it speaks for, so a row cannot outlive a change of what its id
@@ -112,6 +114,15 @@ pub fn lower(input: &LoweringInput, inv: &Inventory) -> Result<String, LowerErro
     for p in input.predications() {
         sentences.push(clause(input, inv, p)?);
     }
+    let mentioned = |r: &NodeId| {
+        input
+            .predications()
+            .iter()
+            .any(|p| p.roles.iter().any(|f| &f.filler == r))
+    };
+    if input.referents().iter().any(|r| !mentioned(&r.id)) {
+        return unrendered("a referent no role mentions");
+    }
     let mut out = String::new();
     for (i, clause) in sentences.iter().enumerate() {
         if i > 0 {
@@ -164,6 +175,11 @@ fn clause(input: &LoweringInput, inv: &Inventory, p: &Predication) -> Result<Str
         said.push(&fill.filler);
     }
     out.push_str(rest);
+    if p.roles.len() != said.len() {
+        return Err(LowerError::Unrendered {
+            what: "a role the frame does not name",
+        });
+    }
     Ok(out)
 }
 

crates/weksa/tests/lower.rs

@@ -113,12 +113,26 @@ fn a_packet_carrying_what_the_lowerer_does_not_render_is_refused() {
         })
     };
     let no_predication = |p: &mut Packet| p.predications.clear();
+    let extra_role = |p: &mut Packet| {
+        let filler = p.predications[0].roles[0].filler.clone();
+        p.predications[0].roles.push(weksa::packet::RoleFill {
+            role: iv("role:3"),
+            filler,
+        })
+    };
+    let lone_referent = |p: &mut Packet| {
+        let mut r = p.referents[0].clone();
+        r.id = nd("n99");
+        p.referents.push(r)
+    };
     for (what, edit) in [
         ("features", &discourse as &dyn Fn(&mut Packet)),
         ("features", &predication),
         ("relations", &relation),
         ("extensions", &extension),
         ("no predication", &no_predication),
+        ("a role the frame does not name", &extra_role),
+        ("a referent no role mentions", &lone_referent),
     ] {
         let mut p = proof_packet();
         edit(&mut p);