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

scripts/runner.ks

@@ -0,0 +1,23 @@
+switch to 0.
+cd("scripts").
+
+local g is GUI(300).
+set g:x to 100.
+set g:y to 100.
+
+local titleLabel is g:addlabel("Scripts").
+set titleLabel:style:align to "center".
+set titleLabel:style:hstretch to true.
+
+local popup is g:addpopupmenu().
+set popup:optionsuffix to "NAME".
+
+list files in localFiles.
+for f in localFiles popup:addoption(f).
+popup:changed.
+
+g:show().
+wait until popup:changed.
+g:dispose().
+
+runpath(popup:value).