Add BGZ17 Poincare SparseEdgeField plan to index

Author: AdaWorldAPI

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

@@ -1,6 +1,6 @@
 # 3DGS Implementation Plan Index — lance-graph
 
-This directory contains the lance-graph-side implementation plans for the 3DGS geospatial rebuild, the PR-X12 cross-pollination expansion, PhiSpiral256 SoA integration, and the Cesium/BindSpace4 headstone exploration.
+This directory contains the lance-graph-side implementation plans for the 3DGS geospatial rebuild, the PR-X12 cross-pollination expansion, PhiSpiral256 SoA integration, the Cesium/BindSpace4 headstone exploration, and the BGZ17/Poincare SparseEdgeField tectonic-map line.
 
 ## lance-graph responsibility
 
@@ -11,6 +11,7 @@ This directory contains the lance-graph-side implementation plans for the 3DGS g
 - ArcGIS and Cesium source ingestion.
 - Blender scene graph / mesh / material / camera transcode corridor.
 - Cesium/BindSpace4 L1-L4 stream bridge as a headstone/capstone exploration.
+- BGZ17/Poincare SparseEdgeField tectonic-map reconstruction as a sparse sidecar field.
 - Lance/Arrow schemas for tiles, splats, features, metadata, and certificates.
 - Graph/DataFusion/Cypher query interfaces.
 - Integration wiring to `ndarray::hpc::splat3d`, `ndarray::hpc::pillar`, and HHTL kernels.
@@ -55,6 +56,24 @@ Use inline code only for short identifiers such as `lance-graph`, `TileId`, or `
 3DGS-Cesium-BindSpace4-headstone-exploration.md
 ```
 
+## BGZ17 / Poincare sparse field plans
+
+```text
+BGZ17-Poincare-SparseEdgeField-tectonic-map.md
+```
+
+This plan captures:
+
+```text
+BGZ17 recoverable sampling
+Poincare / PhiSpiral256 local direction
+SparseEdgeField atoms
+Gaussian / EWA field reconstruction
+OGIT / OWL / DOLCE semantic inheritance
+GGUF / PR-X12 implicit-context headers
+CausalEdge64 trajectory candidates
+```
+
 ## Blast-radius and datalake plans
 
 ```text
@@ -122,6 +141,20 @@ ndarray 3DGS / depth / PhiSpiral / certificate kernels
 certified tile, content, residual, or render decision
 ```
 
+The BGZ17/Poincare SparseEdgeField flow is:
+
+```text
+field / tensor / scene / semantic map
+        ->
+BGZ17 sparse pressure traces
+        ->
+Poincare-local direction and PhiSpiral256 atom placement
+        ->
+SparseEdgeField sidecar atoms
+        ->
+Gaussian / EWA reconstruction or exact hydration only when certified
+```
+
 The BLAS-backed 3DGS orchestration flow is:
 
 ```text