Extend board outline downward by 15mm to accommodate 6 new components:
U1 (L7805 voltage regulator), C1/C2/C3 (decoupling caps), R1/R2 (pull-down
resistors). Move bottom mounting holes to match new outline. Delete
incorrectly-routed traces for DIR, STEP, LIM_C and unconnected nets, then
re-route them correctly to ESP32 bottom-row pins. Add +5V and +12V power
traces on B.Cu with via for layer transition. Route MOTOR_CTRL on B.Cu to
avoid F.Cu conflicts.
Place U1, C1, C2, C3, R1, R2 in the left open area (x=73-86, y=48-60)
of the board outline. Add copper traces for +12V bus (U1 input to
existing +12V net via A4988), +5V bus (U1 output to ESP32 VIN and C2),
and limit switch signals (/LIM_A to SW1, /LIM_C to existing trace).
Remove orphaned net-0 segments and clear zone fills for regeneration.
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