feat: overhaul lander suicide burn, add transfer GUI, improve ascent fairing logic

- lander.ks: Replace fixed suicide burn with dynamic throttle control using
  vertical fraction, gateRatio, and finalPhase logic; simplify post-land
  sequence to SAS stabilityassist
- transfer.ks: Replace hardcoded Mun target with GUI popup menu populated
  from body:orbitingchildren
- ascent.ks: Change fairing jettison trigger from dynamic pressure to
  altitude > atm height; guard antenna extension with hasmodule check
- basic.ks: Append stayRunner invocation at end of script
- boot/boot.ks: Remove commented RT connection block; add newline before runPath
- boot/testing.ks: Switch to volume 0 and use relative paths for transfer
  and doManeuver scripts
- boot/heloBoot.ks: Delete unused boot file

boot/testing.ks

@@ -1,3 +1,7 @@
 wait until ship:unpacked.
 core:part:getmodule("kOSProcessor"):doevent("Open Terminal").
-runPath("0:/scripts/transfer.ks").
+
+switch to 0.
+cd("scripts").
+runPath("transfer").
+runPath("doManeuver").