Chams: per-relationship, visible/invisible styles and viewmodel

- Hostile/neutral/friendly each have independent visible and through-wall
  settings: enable, style and colour. Viewmodel has its own enable/style/colour.
- Styles: Flat, Wireframe, Additive, Solid, White, Fullbright, Glow outline.
  Additive uses the model solid material + ADDITIVE flag (the VGUI additive
  was invisible on NPCs). White/fullbright are solid-based, so the viewmodel
  no longer disappears/checkerboards. Glow outline adds a wireframe contour
  pass for depth.
- Config: [chams] active/bind, [chams_hostile|neutral|friendly] vis/inv
  settings, [chams_vm]. GUI sections for each group.

1 files changed, 24 insertions, 29 deletions

diff --git a/CONTEXT.md b/CONTEXT.md
index e323588..be526fc 100644
--- a/CONTEXT.md
+++ b/CONTEXT.md
@@ -285,35 +285,30 @@ vocabulary / decisions.
 ## Chams
 
 - Hooks `IVModelRender::DrawModelExecute` (slot 19 in `VEngineModel016`).
-  The model's entity is `ModelRenderInfo_t::entity_index` (32-bit offset 0x30);
-  only entities for which `esp_is_npc_index` says the client class is an NPC
-  are affected.
-- Uses `IVModelRender::ForcedMaterialOverride` (slot 1) with
-  `models/debug/debugwhite` and draws twice: first with
-  `MATERIAL_VAR_IGNOREZ` (1 << 15) set through `IMaterial::SetMaterialVarFlag`
-  (slot 29) for the through-wall pass, then without it. Colour is applied via
-  `IMaterial::ColorModulate` (slot 28) **and** the shader's `$color`/`$color2`
-  vars (IMaterialVar slot 11, SetVecValue 3-float slot 11), because some forced
-  materials ignore ColorModulate. The shared material's flag and colour are
-  restored to (false, white) after the draw.
-- The base game does not mount `models/debug/debugwhite` (EP2-only) or
-  `debug/additivevertexcolorvertexalpha`; the style material is preloaded from
-  `outer_draw` (throttled) and cached. Styles: 0 Flat (`vgui/white`),
-  1 Wireframe (`debug/debugwireframe`), 2 Additive (`vgui/white_additive`),
-  3 Solid (`debug/debugtranslucentsinglecolor`), 4 White
-  (`debug/debugtranslucentvertexcolor`), 5 Fullbright
-  (`debug/debugmrmfullbright2`). A missing style falls back to the solid one;
-  the render hook never calls FindMaterial itself.
-- `Viewmodel (hands/weapon)` applies the override to entities whose class
-  contains `viewmodel` or whose model path is `.../v_...`. Viewmodels always
-  use the solid style (no style flags) with the selected colour; VGUI/white
-  materials do not draw skinned models and made the hands/weapon disappear.
-  Only the normal-depth pass is used.
-- Feature is off by default; `[chams] active/bind/walls/viewmodel/material/r/g/b`,
-  with Through walls, Viewmodel, a Material dropdown and colour in the Visuals
-  card.
-- This is a flat material override, not stencil outlines; depth handling is
-  the simple ignorez/normal two-pass.
+  The model's entity is `ModelRenderInfo_t::entity_index` (32-bit offset 0x30).
+  NPCs are grouped by `esp_npc_relation` (hostile / neutral / friendly);
+  viewmodel entities (class contains `viewmodel` or model path `.../v_...`)
+  are a fourth group.
+- Each relationship has independent **visible** and **through-wall** settings:
+  on/off, style, and colour. The viewmodel has on/off, style and colour only.
+  The through-wall pass uses `MATERIAL_VAR_IGNOREZ` (1 << 15) through
+  `IMaterial::SetMaterialVarFlag` (slot 29); colours use `$color`/`$color2`
+  (IMaterialVar slot 11, SetVecValue 3-float slot 11) and `ColorModulate`
+  (slot 28). Shared materials are restored after each draw.
+- Styles are built from the resident materials and material flags:
+  0 Flat (`vgui/white` with FLAT), 1 Wireframe (`debug/debugwireframe`),
+  2 Additive (`debug/debugtranslucentsinglecolor` + ADDITIVE), 3 Solid,
+  4 White (solid, colour forced white), 5 Fullbright (solid + FLAT|SELFILLUM),
+  6 Glow outline (solid plus a `debug/debugwireframe` contour pass).
+  `models/debug/debugwhite` is EP2-only and the old VGUI additive material is
+  invisible on NPCs; the styles no longer depend on them.
+- Style materials are preloaded from `outer_draw` (throttled) and cached; the
+  render hook never calls FindMaterial itself. A missing style uses solid.
+- Feature is off by default. Config sections: `[chams]` (active/bind),
+  `[chams_hostile|neutral|friendly]` (`vis`, `vis_mat`, `vis_r/g/b`, `inv`,
+  `inv_mat`, `inv_r/g/b`) and `[chams_vm]` (`on`, `mat`, `r/g/b`). The GUI has
+  a Hostile/Neutral/Friendly section each, plus Viewmodel.
+- This is a material override, not stencil outlines.
 
 ## Bones / ESP