An aircraft's speed above BrakeRate goes where its nose points

[HectorBailey]

Closes #23.

The decode, checked against the listing. 0x43D38E–0x43D47D in the Steam/GOG v3.1 binary (same MD5 as the findings): hypot(vel.x, vel.z) compared with def+0x19A (brakerate) as floats; at or below, nothing. Above, vel.x and vel.z are each multiplied by brakerate/speed in 16.16, then excess = speed - brakerate is put through the sin and cos of the unit's heading word at unit+0x66 and added to vel.x and vel.z. vel.y is never read. That is exactly what §1's table says.

What changed.

• applyBrakeRateNoseReaim(velocity, nose, brakeRate) in UnitBehaviorService_util, with the addresses in the comments.
• computeNewAirUnitVelocity calls it after drag and before the profile, the original's order. That function serves the flying state and take-off.
• Not applied to the attack run, the gunship ring or the dogfight, which have their own velocity functions and their own decoded geometry. Called out in the notes as the next pass.
• docs/TOTALA-EXE.md §1 "Deliberately not ported" and the summary line at §88 updated.

Verified, with real FBI values from rev31.gp3 (ARMFIG 10/6/0.35/512, CORVAMP 12/7/0.35/620, ARMCA 6.9/1.5/0.06/90):

• brakerate.test.cpp: at or below BrakeRate unchanged; excess goes along the nose (10 sideways with BrakeRate 6 becomes 6 across and 4 ahead); vertical untouched; never faster than it came in.
• A ninety-degree turn driven the way updateUnitRotation and updateUnitSpeed drive it: the Freedom Fighter's worst crab drops from about 53° to under 15° and the Vamp's by more than half; the construction aircraft moves by under a degree, matching the earlier 0.00° bank measurement.
• rwe_test: all 555 test cases pass (71500 assertions), Linux gcc-14 Debug, including the existing aircraft and bank tests whose fixtures the rule now touches.
• Not play-tested in a running game here (the Linux run needs A chosen view refers to the caller's range, not a copy of it #17 first). The test drives the same two update functions the scene does.

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