Answer upstream Discussion #161 with data: is the IWR6843 upgrade significant?

[dieterolson]

Tier 2 (contribution opportunities item 8).

Upstream Discussion #161 (jtemple967, active this week): a K-LD7 builder asks whether the IWR6843 upgrade is worth it - "would be willing to upgrade if it's significant." Nobody has published a comparison. JedS also opened #81 "Launch monitors comparison".

I can't produce new K-LD7 data (no K-LD7 hardware) but CAN produce the honest version:

• MLM2-referenced IWR6843 accuracy report from my rig (bias/MAE per club, coverage, angle_source split)
• Set against the published K-LD7-era field numbers and the July IWR field report (irons 0.83 deg MAE / driver 3.55)
• Post to Discussion #161 + this repo's notes/