Fix wind particles not visibly moving

Two bugs caused particles to appear stationary:

1. Speed constant was 0.03 (particles moved ~7 px/s at 10 kt — barely
   perceptible). Changed to 0.1 so a 10-kt particle crosses the full
   viewport in MAX_AGE seconds (~24 px/s), producing clear streaming.

2. Individual respawn assigned a random age in [0, MAX_AGE). Half of
   all newly spawned particles were born old and faded out almost
   immediately without traversing visible distance, giving a "static
   noise" look rather than flowing motion. Respawn now starts near age 0
   (with a 0–2 s jitter to desynchronise simultaneous respawn bursts).

https://claude.ai/code/session_017TwkSjhzhmTcHKmVG5MWUa

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