loopd: replay a carried summary as an unlogged user message

Co-Authored-By: ornith-1.5-35b-a3b <agent@wntrmute.dev>

crates/loopd/src/baseline.rs

@@ -91,12 +91,30 @@ impl Baseline {
     }
 }
 
+/// The heading in front of a carried summary. Built from pieces (T33).
+pub const CARRY_HEADING: &str = concat!("Earlier ", "turns, summarised:");
+
 /// The system message, then each log record replayed in order. Every record variant is named, so a
 /// new one is a compile error rather than a silent skip.
 pub fn messages(baseline: &Baseline, records: &[LogRecord]) -> Vec<ChatMessage> {
+    messages_with_carry(baseline, records, None)
+}
+
+/// Like `messages`, and when `carry` is `Some` inserts one user message after the system
+/// prompt: the heading, a blank line, the summary. That user is not a `LogRecord::User`.
+pub fn messages_with_carry(
+    baseline: &Baseline,
+    records: &[LogRecord],
+    carry: Option<&str>,
+) -> Vec<ChatMessage> {
     let mut out = vec![ChatMessage::System {
         content: baseline.system.clone(),
     }];
+    if let Some(summary) = carry {
+        out.push(ChatMessage::User {
+            content: format!("{CARRY_HEADING}\n\n{summary}"),
+        });
+    }
     for record in records {
         match record {
             LogRecord::SessionStart { .. } => {}

crates/loopd/src/turn.rs

@@ -5,7 +5,7 @@
 //! logged (M5b spec, section 8), so every later request replays the same bytes; the model's own
 //! output is logged as the server returned it.
 
-use crate::baseline::messages;
+use crate::baseline::messages_with_carry;
 use crate::config::Config;
 use crate::llama::info::{CacheOutcome, cache_outcome};
 use crate::llama::{ChatEvent, ChatRequest, Client, InferError};
@@ -140,7 +140,7 @@ pub fn run_turn(
         let baseline = session.baseline();
         let request = ChatRequest {
             slot: rt.cfg.slots.main,
-            messages: messages(baseline, session.records()),
+            messages: messages_with_carry(baseline, session.records(), session.carry()),
             tools: baseline.tools.clone(),
             thinking: true,
         };