Add the channel messages and the usage record to proto

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

crates/proto/tests/strict.rs

@@ -69,11 +69,18 @@ fn envelopes_reject_unknown_keys_at_every_depth() {
         "tool_response_failed.json",
         "tool_response_denied.json",
         "error.json",
+        "turn.json",
+        "turn_event_tool_result.json",
+        "turn_event_content.json",
+        "turn_event_retrying.json",
+        "turn_done.json",
+        "error_session_full.json",
     ] {
-        // Envelope, msg and body: three objects.
+        // Envelope, msg and body: three objects; turn_done also has a usage object.
+        let want = if name == "turn_done.json" { 4 } else { 3 };
         assert_eq!(
             check::<Envelope>(name, &fixture(&format!("wire/{name}"))),
-            3,
+            want,
             "{name}"
         );
     }
@@ -100,6 +107,16 @@ fn log_records_reject_unknown_keys_at_every_depth() {
     assert_eq!(tried, 8);
 }
 
+#[test]
+fn usage_log_records_reject_unknown_keys_at_every_depth() {
+    let mut tried = 0;
+    for (i, line) in fixture("records/session_usage.jsonl").lines().enumerate() {
+        tried += check::<LogRecord>(&format!("session_usage.jsonl:{}", i + 1), line);
+    }
+    // Seven records, plus the one tool call inside the first assistant record.
+    assert_eq!(tried, 8);
+}
+
 #[test]
 fn grants_reject_unknown_keys_at_every_depth() {
     let grant: Grant = toml::from_str(&fixture("grant/full.toml")).unwrap();