Make the double tap a stance that holds the net

Oliver on v376: "wenn man doppeltippt, geht er minimal vor". His own
ball's flight covered 4-9 m of the 10 to the net. His next ball was met
from mid-court, outside the net zone, and the recovery after that volley
walked him straight back to the baseline.

The double tap now sets a stance (P.post) that lasts until the next
double tap, a lob he has to run down, or the end of the point. Every
recovery heads for the net at full pace, and every incoming ball is
planned as a net man's. The 'back' stance clears once he is behind the
net zone, so short balls still pull him in.

Measured: contacts while committed are ~35% at the net and ~40% around
the service line, and he no longer falls back. The base ladder is
unchanged. New test; v377.

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

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