feat(F-060): completed feature

work/artifacts/F-060/qa.json

@@ -0,0 +1,16 @@
+{
+  "feature_id": "F-060",
+  "agent": "qa",
+  "verdict": "APPROVED",
+  "summary": "End-to-end trace. 42 thumbnails regenerated with new dimensions. All 3 apps serve them with the correct aspect ratio. No regressions detected on existing files or services.",
+  "evidence": [
+    "AC1 'Script uses fit inside with maxHeight = size × 1.4' — source diff confirms",
+    "AC2 'FORCE flag regenerates existing cached thumbnails' — script ran with FORCE=1 and reported 42 new thumbnails",
+    "AC3 'All cached thumbnails now use the new bounded-box behaviour' — file dimensions on disk match the contract",
+    "AC4 'Non-square source thumbnails are not cropped' — 600x800 → 40x53 (aspect preserved)",
+    "AC5 'verify.sh is green' — exit 0",
+    "Regression: ./scripts/generate-thumbnails.sh without FORCE still skips existing files (0 generated) — backward compatible",
+    "Regression: HTTP 200 on /uploads/40/ and /uploads/200/ from all 3 apps"
+  ],
+  "timestamp": "2026-08-19T14:55:00Z"
+}