fix: render channel before recipient

as according to docs
https://cookbook.openai.com/articles/openai-harmony#handling-tool-calls

empirically this is also what the model outputs

src/encoding.rs

@@ -820,6 +820,12 @@ impl Render<Message> for HarmonyEncoding {
             }
         };
 
+        // next header channel
+        if let Some(channel) = &message.channel {
+            self.render_formatting_token_into(FormattingToken::Channel, into)?;
+            self.render_text_into(channel, into)?;
+        }
+
         // next render the header recipient, if there is one
         if let Some(recipient) = &message.recipient {
             if recipient != "all" {
@@ -827,12 +833,6 @@ impl Render<Message> for HarmonyEncoding {
             }
         }
 
-        // next header channel
-        if let Some(channel) = &message.channel {
-            self.render_formatting_token_into(FormattingToken::Channel, into)?;
-            self.render_text_into(channel, into)?;
-        }
-
         // finally content type
         if let Some(content_type) = &message.content_type {
             self.render_text_into(format!(" {content_type}"), into)?;

test-data/test_does_not_drop_if_ongoing_analysis.txt

@@ -1 +1 @@
-<|start|>user<|message|>What is the weather in SF?<|end|><|start|>assistant<|channel|>analysis<|message|>User asks: “What is the weather in SF?” We need to use lookup_weather tool.<|end|><|start|>assistant to=functions.lookup_weather<|channel|>commentary <|constrain|>json<|message|>{"location": "San Francisco"}<|call|><|start|>functions.lookup_weather<|message|>{"temperature": 20, "description": "sunny"}<|end|><|start|>assistant
+<|start|>user<|message|>What is the weather in SF?<|end|><|start|>assistant<|channel|>analysis<|message|>User asks: “What is the weather in SF?” We need to use lookup_weather tool.<|end|><|start|>assistant<|channel|>commentary to=functions.lookup_weather <|constrain|>json<|message|>{"location": "San Francisco"}<|call|><|start|>functions.lookup_weather<|message|>{"temperature": 20, "description": "sunny"}<|end|><|start|>assistant