Add blast radius datalake and domain adapter plans to lance-graph index

Author: AdaWorldAPI

.claude/plans/3DGS-PLAN-INDEX.md

@@ -14,6 +14,7 @@ This directory contains the lance-graph-side implementation plans for the 3DGS g
 - Integration wiring to `ndarray::hpc::splat3d`, `ndarray::hpc::pillar`, and HHTL kernels.
 - Runtime selection policy, traversal, scheduling, and certified tile decisions.
 - SplatShaderBlas / BLASGraph orchestration across bitpacked, palette, and 3DGS tiers.
+- Datalake HHTL traversal and domain adapter strategy.
 - Cross-domain raw-field fanout into ultrasound, genetics, neuronal networks, and 4x4 cognitive-shader blocks.
 
 ## Markdown convention
@@ -48,6 +49,14 @@ Use inline code only for short identifiers such as `lance-graph`, `TileId`, or `
 3DGS-SplatShaderBlas-BLASGraph-crosspollination-plan.md
 ```
 
+## Blast-radius and datalake plans
+
+```text
+3DGS-HHTL-datalake-traversal-plan.md
+3DGS-blast-radius-application-map.md
+3DGS-domain-adapter-strategy-plan.md
+```
+
 ## Cross-domain fanout plans
 
 ```text
@@ -88,6 +97,18 @@ ndarray EWA/SYRK/BLAS backend kernels
 certified covariance / render decision report
 ```
 
+The datalake HHTL flow is:
+
+```text
+SQL / graph / vector / semantic query
+        ->
+lance-graph metadata traversal over datasets/fragments/blocks
+        ->
+ndarray optional field-kernel scoring/certification kernels
+        ->
+certified skip / refine / hydrate decision report
+```
+
 The 4x4 raw-field fanout flow is:
 
 ```text