fix(nit): align CommitID field in vcs/types.go and document no-op in github/review.go

github/review.go

@@ -108,6 +108,7 @@ func (c *Client) PostReview(ctx context.Context, owner, repo string, number int,
 			} else if payload.CommitID != comment.CommitID {
 				return nil, ErrConflictingCommitIDs
 			}
+			// else: matching SHA is a no-op by design
 		}
 		payload.Comments = append(payload.Comments, reviewCommentEntry{
 			Path:     comment.Path,

vcs/types.go

@@ -97,6 +97,7 @@ type ReviewRequest struct {
 	// CommitID anchors the review to a specific commit SHA.
 	// If empty, the platform defaults to the current PR head.
 	// Adapters use this as the primary commit anchor for the review submission.
-	CommitID string          `json:"commit_id,omitempty"`
+	CommitID string `json:"commit_id,omitempty"`
+
 	Comments []ReviewComment `json:"comments,omitempty"`
 }