fix: revert streaming, add dedup and format enforcement

mcp/review.ts

@@ -213,6 +213,46 @@ export const CreatePullRequestReview = type({
     .optional(),
 });
 
+/**
+ * Remove duplicate inline comments on the same file. Uses Jaccard similarity
+ * on content words — if two comments on the same file share ≥40% of their
+ * significant words they're almost certainly the same finding repeated.
+ */
+function deduplicateComments(comments: ReviewCommentInput[]): ReviewCommentInput[] {
+  const STOPWORDS = new Set(["the", "this", "that", "with", "from", "have", "will", "when", "also", "both", "into", "than", "then", "they", "some", "more", "and", "but", "for", "are", "not", "use"]);
+  const keywords = (text: string): Set<string> =>
+    new Set((text ?? "").toLowerCase().split(/\W+/).filter((w) => w.length > 3 && !STOPWORDS.has(w)));
+
+  const jaccard = (a: Set<string>, b: Set<string>): number => {
+    const inter = [...a].filter((w) => b.has(w)).length;
+    const union = new Set([...a, ...b]).size;
+    return union === 0 ? 0 : inter / union;
+  };
+
+  const byPath = new Map<string, ReviewCommentInput[]>();
+  for (const c of comments) {
+    const group = byPath.get(c.path) ?? [];
+    group.push(c);
+    byPath.set(c.path, group);
+  }
+
+  const result: ReviewCommentInput[] = [];
+  for (const [, group] of byPath) {
+    const kept: ReviewCommentInput[] = [];
+    for (const candidate of group) {
+      const ckw = keywords(candidate.body ?? "");
+      const isDup = kept.some((k) => jaccard(ckw, keywords(k.body ?? "")) >= 0.4);
+      if (isDup) {
+        log.info(`deduped inline comment at ${candidate.path}:${candidate.line} — similar to existing comment on same file`);
+      } else {
+        kept.push(candidate);
+      }
+    }
+    result.push(...kept);
+  }
+  return result;
+}
+
 /** Assemble the **Reviewed changes** preamble block from structured params. */
 function assemblePreamble(preamble: string, changes: string[]): string {
   const lines = [`**Reviewed changes** — ${preamble}`];
@@ -350,15 +390,15 @@ export function CreatePullRequestReviewTool(ctx: ToolContext) {
 
       runDiffCoveragePreflight({ ctx });
 
-      // Build review comments
-      const reviewComments: ReviewCommentInput[] = comments.map((c) => {
+      // Build review comments (deduplicate same-file same-topic comments first)
+      const reviewComments: ReviewCommentInput[] = deduplicateComments(comments.map((c) => {
         let commentBody = fixDoubleEscapedString(c.body || "");
         if (c.suggestion !== undefined) {
           const block = "```suggestion\n" + c.suggestion + "\n```";
           commentBody = commentBody ? `${commentBody}\n\n${block}` : block;
         }
         return { path: c.path, line: c.line, side: c.side || "RIGHT", body: commentBody, start_line: c.start_line };
-      });
+      }));
 
       let droppedComments: DroppedComment[] = [];
       let validComments: ReviewCommentInput[] = [];