Project TX video extractions into hugs research; dedupe AGENTS.md grab item; close research phase

HANDOFF.md

@@ -263,11 +263,16 @@ PropShop, PropGrabber, PhysicsHands, BodyRig, FadeLayer/Fade. Action map: `openx
    wants to pursue a full physics VR body (also as reusable tech for a second project idea);
    the hug should be mostly physics with detection for future interactivity. Research done:
    `research/vr-body-physics-hugs.md` (prior art + phased design; §6 = Nimso's "Hybrid
-   Presence", the closest known implementation, closed-source, only videos) and
-   `research/vr-body-physics-godot.md` (verified stack facts: no Generic6DOF, hinge velocity
-   motors work, PD-follow proven by the hands). Owner offered video-extraction of Nimso's
-   deep-dive videos — pending. Recommendation shape: staged torso → 2-segment arm chains
-   (chase-driven, Boneworks/Nimso tier, NOT per-bone skeleton sim), test hugging props.
+   Presence", the closest known implementation; §7 = owner-extracted video breakdowns of
+   Project TX: hierarchical per-joint force budgets, script-relaxation hand adaptation,
+   active-ragdoll NPCs with grab anchors) and `research/vr-body-physics-godot.md` (verified
+   stack facts: no Generic6DOF, hinge velocity motors work, PD-follow proven by the hands).
+   Research verdict: the technique is an independent-implementation match of our existing
+   chase-drive architecture; no more video extraction needed now (conditional: Spideriini
+   elbow handling if Stage-2 elbow jitter bites; Test Chamber if a locomotion stage ever
+   starts). Recommendation shape: staged torso → 2-segment arm chains (chase-driven,
+   Boneworks/Nimso tier, NOT per-bone skeleton sim), test hugging props; muscle model =
+   hierarchical budgets (hand ≺ forearm ≺ shoulder ≺ torso) scaled from body mass.
    Character model: keep boxes for the physics work (owner asked; see research §5-6).
 2. **Grab points on special objects** — grab is palm-proximity to the prop origin today;
    special objects may want authored grab anchors (see `research/vr-grabbing.md` taxonomy).