[rhorvath02]

Purpose

Give each subsystem one physical calibration record instead of repeating unrelated scalar parameters across assemblies.

Approach

Add nested records for chassis, frames, axles, wheels, brakes, halfshafts and differentials, plus engine/transmission records. Preserve derived mass-property relationships and keep architecture choices separate from calibration.

Validation

Record references, package entries and Modelica formatting checked. Existing vehicle constructors remain usable at this stage.

[raorjun]

Two new record defaults turn required calibration into silent zeros. A record that omits these fields now translates and runs with wrong physics.

[raorjun]

Fixed in 010c2a5. driverMass and the wheel vertical calibration have no default now, so a record that omits them fails at translation. All 9 VehicleDefn records already set both. Six test fixtures did not, so they now set the values explicitly: TestWheelPhysicsVariants in 8b229a9 (#43), and TestFrameRigid, TestFrameCompX, TestFourMF52Kinematic, TestFourMF52Transient and TireForceFrameSmoke in 39ffd9c (#48). Rigs with no driver set m = 0 explicitly. VehicleSim, FourPostSim, KnCLocked, KnCSteerable and VehicleFMI translate at the stack tip.

[raorjun]

Approve. CI is green, and the review findings are fixed or addressed in the comments above.