fix: 11 verified bugs from codebase audit

[test1card]

Critical fixes:

• thermo.py: fix u_air() broken energy equation (h-u=RT, not R(T-T_ref))
  that caused variable thermo mode to underestimate cooling by 162x
• cli.py: fix MC command swapping N_par and n_int_per_interface, which
  halved orifice area vs sweep/thermal commands

Medium fixes:

• flow.py: add laminar-turbulent blending zone (Re 2000-4000) to eliminate
  75% discontinuity in friction factor at Re=2300
• solver.py: add terminal events to solve_case_stream() to prevent
  negative mass and enable early stopping (matching solve_case behavior)
• profiles.py: change table profile 200-2000 Pa guard from raise to
  warning (was blocking legitimate low-pressure data)
• profiles.py: enforce p_floor in barometric profile and add input guards
• validity.py: use T0 instead of node T for Knudsen check on reverse flow
  from external boundary

Low fixes:

• validity.py: dispatch to mdot_fanno_tube for Fanno edges in validity
• compare.py: handle shape mismatch in compare_runs for different topologies
• io.py: fix fallback version from "9.0.0" to "10.0.0"
• solver.py: improve _property_model error message for isothermal mode

Tests updated:

• test_v9_features.py: extend variable thermo test to 0.3s with T check
• test_validity_and_units.py: expect warning instead of ValueError
• test_solver_stream.py: allow early termination in chunk count assertion

https://claude.ai/code/session_01PwDxpNDVJXVejy1rSoCUsS

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