int_speed/shd_speed granted +max_speed/+acceleration per level to a
single vessel, which is redundant now that #59/#62 gave the whole
fleet a shared speed fader instead - a per-ship speed stat has nothing
left to meaningfully affect since #59's multiplier is applied at the
point of use in Ship.gd regardless of the ship's own base stats.
Deleted both upgrade resources and their vessel-definition references
outright rather than leaving them unused.
test_ship_lab.gd's per-vessel-type isolation check used int_speed as
an arbitrary interceptor-only upgrade to prove it doesn't leak into
transporter stats - swapped to int_range, which still exists. Its
upgrade-card-count assertion updated for 3 remaining interceptor
upgrades instead of 4.
