Research: exhaustive Nimso Project TX study (82 video transcripts) + Boneworks/BIMOS rig reference

- research/nimso-project-tx.md: chronological per-video notes 2017-2026, topic synthesis,
  VR Messs scope, proportions & calibration (Winter/Drillis-Contini/Dempster tables verified),
  open unknowns
- research/sources/nimso-transcripts/: yt-dlp auto-caption transcripts + dated index (re-pullable)
- research/vr-physics-rig-hexabody.md: BIMOS/HexaBody/Boneworks reference, Box3D native joint
  mapping (spherical/motor/prismatic/distance), superseded-as-target note
- AGENTS/HANDOFF research pointers

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

HANDOFF.md

@@ -208,7 +208,9 @@ TERMINOLOGY (owner-corrected — use precisely):
   < 0.2 m, recovers < 2 cm, never tunnels, rebounds), teleport snap, self-right (< 3° after
   a pitch impulse). Must print **"BODY: overall PASS"** 3× deterministic.
 
-Research (`research/`): seven full sourced reports — `vr-arm-ik.md`, `vr-arm-ik-deep.md`,
+Research (`research/`): **`nimso-project-tx.md`** (exhaustive study of Nimso's Project TX player from 82 of his
+video transcripts in `research/sources/nimso-transcripts/` — the design being recreated; read first for body work),
+`vr-physics-rig-hexabody.md` (Boneworks/BIMOS rig reference + Box3D native joint mapping), and seven full sourced reports — `vr-arm-ik.md`, `vr-arm-ik-deep.md`,
 `vr-grabbing.md`, `vr-two-handed-grab.md` (grab v5.0→5.2 history + the verified Box3D pin
 joint internals + dated CORRECTION section), `godot-box3d-weld.md` (the addon patch: weld
 mapping, param table, build recipe, risks), `vr-body-physics-hugs.md` (player-body physics +