KB: correct stale StartEntityEffectImplementation entry (dispatcher DONE 2026-07-13)

The per-zone effect dispatcher was reconstructed + wired the same day the audit
flagged it as 'RECOMMENDED NEXT TARGET' -- the entry was never updated. Correct it:
dispatcher done (btl4vid.cpp:889, wired at mechdmg.cpp:1120); the real remaining
FX gap is the six still-STUBBED L4VIDRND scaling-explosion renderable bodies.

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

context/open-questions.md

@@ -23,13 +23,16 @@ authentic path scoped.
 
 ## BINARY-COVERAGE AUDIT discoveries (2026-07-13, 6-agent decomp census) [T1 verified-uncited]
 New unaccounted functionality no prior list knew (addresses verified absent from game/+context/+docs):
-- **`BTL4VideoRenderer::StartEntityEffectImplementation` @004d097c** (+helpers @4d0c14/@4d0c5c,
-  ~93 ln) — the per-zone EFFECT DISPATCHER, vtable-dispatched from the engine's
-  StartEntityEffectMessageHandler (hence invisible to address-grep).  Body fully mapped: zone
-  position (+0x74), video index (+0xc4→+0xc0), jointToDCS socket (+0x3a4, in CLASSMAP),
-  SearchList type 10, atoi-dispatch into the SAME effect-number bands the port already serves
-  (>=1000 psfx ✓, 3-15 specialfx ✓, 104 SwapToWreck ✓).  **The whole per-zone damage/destruction
-  visual chain is dead without it.  RECOMMENDED NEXT TARGET (S/M).**
+- **✅ `BTL4VideoRenderer::StartEntityEffectImplementation` @004d097c — DONE (2026-07-13) [T2].**
+  The per-zone EFFECT DISPATCHER (+helpers @4d0c14 StopAll / @4d0c5c) is reconstructed
+  (btl4vid.cpp:889) + WIRED: `MechDamageZone` change → `BTStartZoneEffect` →
+  RendererManager::StartEntityEffect → this virtual → the band effect ATTACHED to the struck
+  zone's segment (smoke/fire follows the mech); the Destroyed descriptor fires on kill
+  (mechdmg.cpp:1120). Band smoke/fire (psfx ≥1000) render through the live PFX layer
+  (BTStartPfxAttached). ⚠ **NOT yet liveness-verified at runtime** — needs a 2-node/enemy setup
+  (solo DEV.EGG has no target). ⚠ **REMAINING FX GAP:** the SIX L4VIDRND explosion-renderable
+  bodies below are still 2007 `//STUBBED` — the SCALING booms/flames the dispatcher routes to
+  (3-15 specialfx band + ScalingExplosionRenderable) never draw; only the particle bands do.
 - **Six L4VIDRND effect-renderable bodies** @4540ac/45447c/455eb8/456cf0/4589e0/458e5c (~576 ln)
   incl. the 40-param ScalingExplosionRenderable ctor ExplosionScripts calls 6× — the live 1995
   bodies behind the STUBBED markers (wreck flames/booms land into these).