Storylines: the same site told several ways, one per visitor, counted

Any text a person reads may be a list, one entry per storyline, every
list the same length. A visitor is given one storyline for the whole
site and reads it on every page and in every mail about their case.
Records and events carry the storyline; GET /report gives counts per
bucket, storyline and state, and nothing else.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GT37Z1Xtfd9pUuQtMTg6Yt

src/memberships.rs

@@ -226,6 +226,7 @@ async fn move_to(state: &crate::server::AppState, store: &async_nats::jetstream:
         alternative: target.to_string(),
         responses: payload,
         timestamp_ms: now_ms,
+        storyline: answer.storyline,
     };
     let _ = crate::events::emit_answer_submitted(&state.nats, &event).await;
     Ok(answer)
@@ -266,7 +267,7 @@ pub async fn grant(state: &crate::server::AppState, group: &str, name: &str, who
                 "name": name, "group": group, "by": by,
                 "phone": who.phone, "email": who.email, "sub": who.sub,
             });
-            crate::answers::store_answer(&state.jetstream, &state.aggregates.load(), BUCKET, id, "/", "Membership", &responses, now_ms).await?;
+            crate::answers::store_answer(&state.jetstream, &state.aggregates.load(), BUCKET, id, "/", "Membership", &responses, now_ms, 0).await?;
             Ok(invited(true))
         }
     }
@@ -346,6 +347,7 @@ mod tests {
             responses: serde_json::json!({ "group": group, "phone": phone, "email": email, "sub": sub, "name": "X" }),
             state: state.into(),
             submitted_ms: 0,
+            storyline: 0,
             decided_ms: None,
             decided_by: None,
             notes: Vec::new(),