KB: full staleness audit + sweep -- 35 verified corrections across 16 topics, 15 new glossary terms

Adversarially-verified audit (18 agents) against the task #46-#56 landings:
MP/current-state understatements, superseded punch readings, retired env
gates, dead paths, line-cite drift; env-gate hub table completed.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

context/rendering.md

@@ -3,7 +3,7 @@ id: rendering
 title: "Rendering — the D3D9 pipeline, materials, sky, beams, performance"
 status: established
 source_sections: "PROGRESS_LOG.md §10 (render-fidelity notes); docs/BGF_FORMAT.md"
-related_topics: [bgf-format, asset-formats, wintesla-port, locomotion, pod-hardware]
+related_topics: [bgf-format, asset-formats, wintesla-port, locomotion, pod-hardware, cockpit-view]
 key_terms: [L4D3D, material-ramp, BSL, LOD, DPL, beam]
 open_questions:
   - "Replacement-LOD for NON-additive multi-LOD models; day/night material path priority (BT_MATPRI)"
@@ -22,6 +22,9 @@ mech — WHITE baked verts) is UNLIT, colorized by the material's 2-endpoint **[
 (`dpl_SetMaterialRamp` — texture luminance indexes a low→high gradient); **normal-bearing geometry**
 (~150 vehicle/missile files) is LIT by the map light. Applying the ramp to lit geometry = the "dusty
 white blobs" bug (gate on `hasNormals`). [T2]
+Exception: cockpit-frame (`*_cop`) batches are pure-emissive constant colour (0.13,0.12,0.15),
+`BT_COP_FRAME` overrides — see [[cockpit-view]] (task #55; the old `BT_COP_RAMP_L` ramp-index
+approach is retired). [T2]
 
 ## The big render-fidelity fixes (dbase/desert matched to pod footage)
 - **Geometry:** CONN is a flat trilist (not fan); CONN+PCONN coexist — see [[bgf-format]]. Malformed
@@ -37,10 +40,16 @@ white blobs" bug (gate on `hasNormals`). [T2]
   `L4DPLCFG`): resolves map+time → clip/fog/ambient + a directional sun. Bring-up stubs
   (EnsureValidProjection / per-frame ambient / uninit cloud colours) had clobbered it — now they
   RE-ASSERT the env values. Debug: copy BTDPL.INI → *DBG.INI with `debug=True`. [T2]
+- **Projection / stencil (task #55):** the BTDPL.INI `viewangle=60` is the **HORIZONTAL** FOV —
+  authentic 60×47 frustum at 4:3; fovY derived via `BTFovYFromHorizontal` (L4VIDEO.cpp), applied at
+  all 5 projection sites (it was mis-applied as vertical). The device depth-stencil is now
+  **`D3DFMT_D24S8`** for the cockpit punch stencil-cut (L4VIDEO.cpp:2799; sequence
+  L4D3D.cpp:1199-1248) — see [[cockpit-view]]. [T2]
 
 ## Backface culling (default CW, `BT_CULL`)
 The bring-up `D3DCULL_NONE` drew interior/back faces (the "dark wedge" shapes = mesh insides). CW is
-correct for the BGF quad triangulation `[a b c][a c d]`. [T2]
+correct for the BGF quad triangulation `[a b c][a c d]`. [T2] Exception: cockpit `*_cop` batches
+default DOUBLE-SIDED (`BT_COP_SINGLE=1` restores single-siding, diag) — see [[cockpit-view]]. [T2]
 
 ## LODs (default: shipping-engine first-LOD + ADDITIVE_LODS; `BT_ADDLOD`/`BT_LOD_SCALE`/`BT_PUNCH`)
 See [[bgf-format]] for the √3 range decode, the ADDITIVE_LODS cumulative rule, PUNCH cutouts, and the