ci: increase fp-stability case step counts to 50 for better sweep coverage

Author: sbryngelson

tests/fp_stability/cases/air_water_interface/simulation.inp

@@ -65,28 +65,28 @@
     {
         "name": "sod_standard",
         "description": "1-D standard Sod, p_L/p_R=10, ideal gas (well-conditioned baseline)",
-        "compare": ["cons.1.00.000005.dat", "cons.3.00.000005.dat"],
+        "compare": ["cons.1.00.000050.dat", "cons.3.00.000050.dat"],
         "threshold": 1e-13,
         "ill_cond": "",
     },
     {
         "name": "sod_strong",
         "description": "1-D Sod, p_L/p_R=100,000, ideal gas",
-        "compare": ["cons.1.00.000010.dat", "cons.3.00.000010.dat"],
+        "compare": ["cons.1.00.000050.dat", "cons.3.00.000050.dat"],
         "threshold": 1e-10,
         "ill_cond": "HLLC xi factor: (s_L - vel_L)/(s_L - s_S) cancels near sonic contact",
     },
     {
         "name": "water_stiffened",
         "description": "1-D water shock, stiffened EOS (pi_inf=4046)",
-        "compare": ["cons.1.00.000010.dat", "prim.3.00.000010.dat"],
+        "compare": ["cons.1.00.000050.dat", "prim.3.00.000050.dat"],
         "threshold": 1e-10,
         "ill_cond": "Pressure recovery: p=(E-pi_inf)/gamma loses ~4 digits (pi_inf/p_right~40,000)",
     },
     {
         "name": "air_water_interface",
         "description": "1-D air/water isobaric contact (two-fluid, pi_inf=4046)",
-        "compare": ["cons.1.00.000005.dat", "cons.4.00.000005.dat", "cons.5.00.000005.dat"],
+        "compare": ["cons.1.00.000050.dat", "cons.4.00.000050.dat", "cons.5.00.000050.dat"],
         "threshold": 1e-10,
         "ill_cond": "Mixed-cell pressure recovery: E-alpha_w*gamma_w*pi_inf cancels when alpha_w<<1",
     },