fix(collection-ai): findings fallback tests, rounding

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/lib/server/collection-ai-findings.test.ts

@@ -182,15 +182,50 @@ describe("buildDocFindings", () => {
         { doc_line_no: 2, po_line_id: null },
       ],
     });
-    expect(out.map((s) => s.split(" ")[0])).toEqual([
-      "Document", // covers
-      "Alpha", // not collected
-      "Document", // no PO line
-      "Beta", // collected not on doc
-      "Supplier",
-      "Alpha:", // to follow
-      "Alpha:", // qty
-      "No",
+    expect(out).toEqual([
+      "Document 5028256 covers 2 POs: PO1, PO2.",
+      "Alpha × 40 is on the document but not marked collected.",
+      'Document line "Orphan" doesn\'t match any PO line.',
+      "Beta was marked collected but isn't on the document.",
+      "Supplier on the document (Other Co) differs from the PO supplier (Acme).",
+      "Alpha: supplier shows nothing to follow, but 4 are still outstanding.",
+      "Alpha: order line says 40 but the PO quantity is 4.",
+      "No PO number on the document matched; checked against PO1.",
     ]);
   });
+
+  const toFollow = (po: Partial<PoLineLite>) =>
+    buildDocFindings({
+      ...base,
+      read: read([dl({ line_no: 1, quantity: 30, to_follow: 0 })]),
+      poLines: [pl(po)],
+      pairs: [{ doc_line_no: 1, po_line_id: "p1" }],
+    });
+
+  it("to-follow uses quantity when order_qty is 0", () => {
+    expect(toFollow({ order_qty: 0, quantity: 40, qty_collected: 30 })).toEqual([
+      "M8x25 stainless steel: supplier shows nothing to follow, but 10 are still outstanding.",
+    ]);
+  });
+
+  it("to-follow does not fire when fallback ordered is fully collected", () => {
+    expect(toFollow({ order_qty: 0, quantity: 30, qty_collected: 30 })).toEqual([]);
+  });
+
+  it("rounds float noise in outstanding quantity", () => {
+    expect(toFollow({ order_qty: 0, quantity: 0.3, qty_collected: 0.1 })).toEqual([
+      "M8x25 stainless steel: supplier shows nothing to follow, but 0.2 are still outstanding.",
+    ]);
+  });
+
+  it("prints a single-spaced placeholder for a null document quantity", () => {
+    expect(
+      buildDocFindings({
+        ...base,
+        read: read([dl({ line_no: 1, quantity: null })]),
+        poLines: [pl({ collected: false, qty_collected: 0 })],
+        pairs: [{ doc_line_no: 1, po_line_id: "p1" }],
+      }),
+    ).toEqual(["M8x25 stainless steel × ? is on the document but not marked collected."]);
+  });
 });

src/lib/server/collection-ai-findings.ts

@@ -13,9 +13,9 @@ export type PoLineLite = {
 
 export type LinePair = { doc_line_no: number; po_line_id: string | null };
 
-/** 40 not 40.0; other values as-is. */
+/** 40 not 40.0; at most 3 decimals so float noise never prints. */
 function fmt(n: number): string {
-  return String(n);
+  return String(Math.round(n * 1000) / 1000);
 }
 
 /** Ordered = order_qty, falling back to quantity when order_qty is 0. */