Add thruster Faust patch with an rpm control

Sustained heavy thruster: low rotor rumble, blade-chopped noise rasp,
high-Q hull rattle modes, tanh clip. Compiled as Faust source through
CompileSource; not a .aqua script and not indexed in library.yaml.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

patches/thruster/thruster.dsp

@@ -0,0 +1,27 @@
+// thruster: sustained, heavy, brittle-hull thruster with an RPM control.
+// Compile as Faust source (AquaSynthPatchCompiler.CompileSource); it is not a .aqua script.
+// Control: rpm (300..6000). Rotor tone = 28 Hz + rpm*0.025 (about 36..180 Hz); three blades chop the rasp at 3x that.
+declare name "thruster";
+import("stdfaust.lib");
+
+rpm   = hslider("rpm", 1200, 300, 6000, 1) : si.smooth(ba.tau2pole(0.2));
+load  = (rpm - 300) / 5700;
+shaft = 28 + rpm * 0.025;
+
+// effort: slow random wander of the shaft speed
+wander = no.noise : fi.lowpass(2, 5) : *(0.35);
+f0     = shaft * (1 + 0.04 * wander);
+
+// low rumble: saw at shaft speed plus a square a sub-octave down, low-passed
+rumble = (os.sawtooth(f0) + 0.7 * os.square(f0 * 0.5)) : fi.lowpass(3, 60 + 2.5 * shaft);
+
+// blade pass: rasp noise chopped at 3x shaft, band tracks rpm
+chop = 0.5 + 0.5 * os.osc(f0 * 3) ^ 2;
+rasp = no.noise : fi.resonbp(700 + rpm * 0.6, 1.5, 1) : *(chop);
+
+// brittle hull: high-Q modes rattled by noise, louder with load
+mode(f, q) = no.noise : fi.resonbp(f, q, 1);
+rattle = (mode(173, 40) * (0.3 + 0.7 * load) + 0.8 * mode(311, 35) + 0.6 * mode(467, 30) + 0.4 * mode(1130, 25)) * (0.1 + 0.9 * load ^ 2) * 3;
+
+mix = rumble * (0.5 + 0.5 * load) + rasp * (0.3 + 0.6 * load) + rattle;
+process = mix * (0.4 + 0.6 * load) : *(2.2) : ma.tanh : *(0.5);