Add Navier-Stokes/MHD chiral drag witness note

6-Documentation/famm/NAVIER_STOKES_MHD_CHIRAL_DRAG_NOTE.md

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+# Navier-Stokes / MHD Chiral Drag Witness Note
+
+## Purpose
+
+Record how the Plasma Chiral Drag Witness Gate helps the Navier-Stokes / Burgers / MHD side of the project.
+
+This note does **not** claim to solve Navier-Stokes regularity. It records a narrower and useful role:
+
+```text
+hidden rotational flow / vorticity
+→ wave or image twist witness
+→ signed chirality residual
+→ FAMM scar or closure correction
+```
+
+The strongest domain fit is magnetohydrodynamics (MHD), because the cited plasma result concerns Alfvén waves in a rotating magnetized plasma.
+
+## Core Navier-Stokes object
+
+For incompressible Navier-Stokes:
+
+```math
+\partial_t\mathbf u
++
+(\mathbf u\cdot\nabla)\mathbf u
+=
+-\nabla p
++
+\nu\nabla^2\mathbf u
++
+\mathbf f
+```
+
+with vorticity:
+
+```math
+\boldsymbol\omega=\nabla\times\mathbf u
+```
+
+The difficult regime is where nonlinear transport, shear, vorticity, and unresolved energy transfer hide inside the flow.
+
+## Plasma chiral drag witness
+
+From the Plasma Chiral Drag Witness Gate:
+
+```math
+\Delta\Theta_{\mathrm{img}}
+\approx
+\frac{L\Omega}{2v_A}
+```
+
+Residual receipt:
+
+```math
+R_{\mathrm{chiral}}
+=
+\left|
+\Delta\Theta_{\mathrm{obs}}
+-
+\frac{L\Omega}{2v_A}
+\right|
+```
+
+where:
+
+| Term | Meaning |
+|---|---|
+| `DeltaTheta_img` | image / transverse wave-structure rotation |
+| `L` | propagation path length |
+| `Omega` | medium rotation / torsional flow rate |
+| `v_A` | Alfvén speed |
+| `R_chiral` | mismatch between observed and predicted twist |
+
+## MHD interpretation
+
+In MHD, plasma flow, magnetic field, and Alfvén-wave propagation interact. The image-rotation equation gives a witness channel:
+
+```text
+medium rotation / vorticity
+→ Alfvén wave image rotation
+→ signed torsion/chirality receipt
+```
+
+So the project use is:
+
+```text
+not: prove all Navier-Stokes behavior
+yes: measure hidden rotational structure through a wave witness
+```
+
+## Closure use
+
+A chiral-drag residual can feed an effective closure term:
+
+```math
+\nu_{\mathrm{eff}}
+=
+\nu_0(1+\kappa R_{\mathrm{chiral}})
+```
+
+or, more generally:
+
+```math
+Q_{\mathrm{eff}}
+=
+Q_0
++
+\mathcal C(R_{\mathrm{chiral}},\Omega,\chi,B_0,v_A)
+```
+
+where `Q_eff` is an unresolved forcing / closure / correction channel.
+
+## FAMM mapping
+
+```math
+\mathfrak C_{\mathrm{NS\_MHD\_Chiral}}
+=
+A_{16}(u_{\mathrm{ns\_mhd}})
+\otimes
+[
+\Sigma_{\mathbf u}
++
+\Sigma_{\boldsymbol\omega}
++
+\Sigma_{B_0}
++
+\Sigma_{v_A}
++
+\Sigma_{\Delta\Theta}
++
+\Sigma_{\chi}
++
+\Sigma_{R_{\mathrm{chiral}}}
++
+\Sigma_{\mathrm{closure}}
++
+\Sigma_{\mathrm{receipt}}
+]
+```
+
+## Burgers / triad pipeline connection
+
+For the Burgers/triad witness pipeline:
+
+```text
+resolved solver
++ unresolved residual witness
++ closure correction
+```
+
+this becomes:
+
+```text
+resolved velocity / plasma field
++ Alfvén image-rotation witness
++ torsion/chirality residual
++ closure update
+```
+
+## BraidStorm connection
+
+In BraidStorm, a crossing can carry a chiral-drag witness:
+
+```math
+\beta_{ij}
+:
+(s_i,s_j)
+\to
+(s_i',s_j',r_{ij},\epsilon_{ij},\Omega_{ij},\Delta\Theta_{ij})
+```
+
+where `DeltaTheta_ij` is the signed wave/image twist witness for the crossing environment.
+
+## Warden boundary
+
+This note must not be used to claim:
+
+```text
+Navier-Stokes regularity is solved.
+All fluids expose vorticity through this exact equation.
+Light in vacuum is dragged this way.
+Every torsion model is physically proven.
+```
+
+Allowed claim:
+
+```text
+For NS/MHD-adjacent work, plasma chiral drag provides a citeable witness model for turning hidden medium rotation into measurable signed wave/image rotation, which can be used as a FAMM residual, scar, or closure signal.
+```
+
+## Stack placement
+
+```text
+Navier-Stokes / Burgers / MHD flow
+→ vorticity / torsion field
+→ PLASMA_CHIRAL_DRAG_WITNESS_GATE
+→ FAMM residual / scar ledger
+→ closure correction
+→ NUVMAP Delta-DAG receipt
+→ BJW Judge/Warden boundary
+```
+
+## Project sentence
+
+For Navier-Stokes/MHD work, plasma chiral drag is useful as a vorticity witness: a rotating magnetized medium drags an Alfvén wave's transverse structure, so observed image rotation gives a signed residual for hidden flow rotation, allowing FAMM to scar or correct unresolved torsion in the closure model.