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/lander.ks

@@ -1,3 +1,5 @@
+run once maneuver.
+
 function groundSlope {
   parameter xOffset is 0, yOffset is 0.
   local east is vCrs(north:vector, up:vector).
@@ -30,60 +32,55 @@ function groundSlope {
   return slope.
 }
 
-wait until not hasNode.
+lock h        to ship:bounds:bottomaltradar.
+lock velVec   to ship:velocity:surface.
+lock speed    to velVec:mag.
+lock vSpeed   to ship:verticalspeed.
+lock g        to body:mu / ((body:radius + ship:altitude)^2).
+lock maxA     to ship:maxthrust / ship:mass.
+lock vertFrac to max(abs(vSpeed) / max(speed, 0.001), 0.05).
+
+set margin     to 30.   // safety buffer, meters
+set gateRatio  to 0.9.  // start burn when required decel hits this fraction of max
+set targetV    to -3.   // final drift speed, m/s
+set burning    to false.
+set finalPhase to false.
+
+lock maxDecel      to max(maxA * vertFrac - g, 0.01).
+lock requiredDecel to vSpeed^2 / (2 * max(h - margin, 0.1)).
+lock neededA       to (requiredDecel / vertFrac) + g.
+lock hoverA        to g / vertFrac.   // accel needed to hold current vertical speed constant
 
-// Suicide burn calcs
 set tval to 0.
 lock throttle to tval.
-lock steering to ship:srfretrograde.
+lock steering to srfretrograde.
 
-lock h  to ship:bounds:bottomaltradar.
-lock v0 to ship:verticalspeed.
-lock g  to (body:mu / ((body:radius + ship:altitude)^2)).
-lock a  to ship:maxthrust / ship:mass.
-lock d  to (v0^2) / (2 * (a - g)).
-
-
-// wait for burn
-until h <= (1.1 * d) {
-  clearscreen.
-  print "Altitude AGL   : " + round(h)     at (4, 0).
-  print "Vertical Speed : " + round(v0, 1) at (4, 1).
-  print "Gravity        : " + round(g, 2)  at (4, 2).
-  print "Acceleration   : " + round(a, 2)  at (4, 3).
-  print "Distance       : " + round(d, 2)  at (4, 4).
-  wait 0.
-}
-unlock d.
-unlock a.
-
-set tval to 1.
-
-set steeringLocked to false.
 until h < 1 {
-  if v0 > -4 {
-    // equalize acceleration to stop downward velocity
-    set tval to max(0.001, ship:mass * g / ship:maxThrust).
+  if not burning and requiredDecel >= gateRatio * maxDecel {
+    set burning to true.
   }
-  else if v0 > -6 and not steeringLocked {
-    // slow enough that we just want to kill vertical velocity
-    lock steering to up.
-    set steeringLocked to true.
+
+  if burning and not finalPhase and vSpeed >= targetV {
+    set finalPhase to true.
+  }
+
+  if finalPhase {
+    set tval to max(0, min(1, hoverA / maxA)).
+  } else if burning {
+    set tval to max(0, min(1, neededA / maxA)).
   }
 
   clearscreen.
-  print "Altitude AGL   : " + round(h)             at (4, 0).
-  print "Vertical Speed : " + round(v0, 1)         at (4, 1).
-  print "Gravity        : " + round(g, 2)          at (4, 2).
-  print "Throttle       : " + 100 * round(tval, 3) at (4, 3).
+  print "Alt AGL      : " + round(h, 1)                    at (4, 0).
+  print "VSpeed       : " + round(vSpeed, 1)                at (4, 1).
+  print "Burning      : " + burning                         at (4, 2).
+  print "Final phase  : " + finalPhase                      at (4, 3).
+  print "Throttle     : " + round(tval * 100)                at (4, 4).
   wait 0.
 }
 
 lock throttle to 0.
 unlock throttle.
-clearscreen.
-print "Holding position".
-lock steering to lookDirUp(groundSlope(), ship:facing:upvector).
-wait until ship:angularvel:mag < 0.1.
-wait 5.
-print "Stable".
+unlock steering.
+sas on.
+set sasMode to "STABILITYASSIST".