review classifier: the review table shows a pass/fail symbol, certainty against threshold, and an emoji on the overall line

The review body's table is now: result | check | certainty / threshold |
reason. The result cell is a symbol for what the row did to the review,
after polarity (✅ counted and passed, ❌ counted and failed, ❔ not
counted or no answer), then the model's verdict. The overall line carries
✅ / ❌. Polarity, threshold and counted are folded into those cells.

The prompt asks for a reason under 350 characters; the enforced cap
stays 500, so an overshoot is truncated less often.

swarm-review-classifier/src/answer.rs

@@ -12,6 +12,11 @@ use swarm_queue_client::review_classifier::Verdict;
 /// truncated to this, ending in `…`.
 pub const REASON_MAX_CHARS: usize = 500;
 
+/// The length the prompt asks a reason to stay under. Below `REASON_MAX_CHARS`
+/// so a model that overshoots the ask still lands inside the cap, uncut.
+pub const REASON_ASKED_CHARS: usize = 350;
+const _: () = assert!(REASON_ASKED_CHARS < REASON_MAX_CHARS);
+
 /// One validated answer.
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct Answer {

swarm-review-classifier/src/prompt.rs

@@ -9,7 +9,7 @@ use std::fmt::Write as _;
 
 use swarm_queue_client::review_classifier::{Classification, Polarity, TryOut};
 
-use crate::answer::REASON_MAX_CHARS;
+use crate::answer::REASON_ASKED_CHARS;
 
 /// The system prompt, the same for every run.
 pub const SYSTEM: &str = "\
@@ -89,7 +89,7 @@ pub fn classification_prompt<'a>(shared: &'a str, c: &Classification) -> Prompt<
     };
     let question = format!(
         "## The question\n\nClassification `{}` ({wanted}):\n\n{}\n\n\
-         Answer with the JSON object only. Keep the reason under {REASON_MAX_CHARS} characters.\n",
+         Answer with the JSON object only. Keep the reason under {REASON_ASKED_CHARS} characters.\n",
         c.name,
         c.description.trim()
     );
@@ -296,6 +296,16 @@ diff --git a/src/main.rs b/src/main.rs
         assert_eq!(shared, shared_context(&run()));
     }
 
+    #[test]
+    fn the_question_asks_for_a_reason_under_the_asked_length_not_the_cap() {
+        let c = classification("datetime", "d", Polarity::Positive);
+        let question = classification_prompt("", &c).question;
+        assert!(
+            question.contains("Keep the reason under 350 characters."),
+            "{question}"
+        );
+    }
+
     #[test]
     fn the_shared_context_has_the_full_commit_message_and_a_collapsed_lockfile() {
         let shared = shared_context(&run());