TPS54202 12 V to 5 V / 1 A Synchronous Buck Converter Molecule

@@ -79,4 +79,6 @@ Every step of the build, in order, each with its own page of evidence (checks, s  **20. Fields**: current and heat solved in 3D. [The evidence](steps/20-fields/README.md) +**21. Pour walkthrough**: each pour net lit in turn. [The evidence](steps/21-nets/README.md)+ <!-- /aiflow:steps -->

@@ -0,0 +1,55 @@+# Step 21: Pour walkthrough++the copper pour walkthrough: every poured net (and every loaded, wide or Kelvin net) highlighted on its own in turn, the board framed, so the viewer sees where each net's copper is; the AI names each one++## Visits++- 2026-10-18T22:58:53Z++## What the binary checked++### tour-nets++- **nets**: 4 item(s)++## Screenshots and drawings++**start**++![start](shot-nets-1-start.png)++**screenshot**++![screenshot](shot-nets-1-net-GND.png)++**screenshot**++![screenshot](shot-nets-1-net-VIN.png)++**screenshot**++![screenshot](shot-nets-1-net-VOUT.png)++**screenshot**++![screenshot](shot-nets-1-net-SW.png)++**visit 1-net-GND**++![visit 1-net-GND](shot-nets-1-net-GND.png)++**visit 1-net-SW**++![visit 1-net-SW](shot-nets-1-net-SW.png)++**visit 1-net-VIN**++![visit 1-net-VIN](shot-nets-1-net-VIN.png)++**visit 1-net-VOUT**++![visit 1-net-VOUT](shot-nets-1-net-VOUT.png)++**visit 1-start**++![visit 1-start](shot-nets-1-start.png)