Remote

Parameters-preset model representing typical remote/background tropospheric conditions with low NOx. Migrated from GasChem.jl@8c12c048 src/combined_system.jl:261 (`RemoteConditions` @component). Eleven species concentrations are declared as parameters in SI units (m⁻³); the model exposes them as algebraic outputs (`*_out`) so a parent system or test harness can read presets without depending on MTK parameter-introspection APIs. Based on Seinfeld & Pandis Chapter 6 background conditions: ~30 ppb O₃, ~10 ppt NO, ~20 ppt NO₂, ~80 ppb CO.