memoryd, proto, brokerd, bxctl: repeated error lines written once

Implemented-By: OpenCode session (model recorded in docs/implementer-log.md)

crates/brokerd/src/builtin.rs

@@ -25,16 +25,13 @@ pub fn grants() -> Result<Vec<LoadedGrant>, GrantProblem> {
     let sources: &[(&str, &str)] = &[("builtin-memory", MEMORY), ("builtin-recall", RECALL)];
     let mut out: Vec<LoadedGrant> = Vec::new();
     for (id, text) in sources {
-        let grant = toml::from_str::<Grant>(text).map_err(|error| GrantProblem {
+        let problem = |error: String| GrantProblem {
             file: id.to_string(),
             line: None,
-            problem: error.to_string(),
-        })?;
-        let sha256 = sha256(text.as_bytes()).map_err(|error| GrantProblem {
-            file: id.to_string(),
-            line: None,
-            problem: error.to_string(),
-        })?;
+            problem: error,
+        };
+        let grant = toml::from_str::<Grant>(text).map_err(|e| problem(e.to_string()))?;
+        let sha256 = sha256(text.as_bytes()).map_err(|e| problem(e.to_string()))?;
         out.push(LoadedGrant {
             id: id.to_string(),
             grant,