Add 3DGS SplatShaderBlas BLASGraph cross-pollination plan

Author: AdaWorldAPI

.claude/plans/3DGS-SplatShaderBlas-BLASGraph-crosspollination-plan.md

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+# 3DGS SplatShaderBlas / BLASGraph Cross-Pollination Plan — lance-graph
+
+## Goal
+
+Cross-pollinate the new geospatial 3DGS plans with the existing SplatShaderBlas, EWA-Sandwich, BLASGraph, and PR-X12 codec canon.
+
+The older line already established:
+
+```text
+splat deposition
+  -> EWA sandwich propagation
+  -> L1-L4 spatial BLAS framing
+  -> SplatShaderBlas naming
+  -> BLASGraph / tropical-GEMM / bgz17 scalar sparse substrate
+```
+
+The new 3DGS plans should reuse this spine instead of inventing an unrelated renderer-only path.
+
+## Existing canon to preserve
+
+Prior work distinguishes two tiers:
+
+```text
+SplatShaderBlas-Bitpacked
+  storage: AwarenessPlane16K = [u64; 256]
+  operation: popcount, AND/OR-popcount
+  workloads: set membership, Jaccard, Adamic-Adar, triangle, LPA, Louvain
+
+SplatShaderBlas-Palette
+  storage: BGZ17 palette + distance table
+  operation: D[palette_a[i]][palette_b[j]] lookup
+  workloads: continuous metric similarity, CAM-PQ-like fields
+```
+
+The geospatial 3DGS path adds a third sibling tier:
+
+```text
+SplatShaderBlas-3DGS
+  storage: Lance/Arrow 3DGS blocks + ndarray SoA views
+  operation: EWA sandwich, tile/block traversal, certificate aggregation
+  workloads: maps, ultrasound, raw-field kernels, certified visualization
+```
+
+## BLASGraph correction
+
+Older docs sometimes said:
+
+```text
+lance-graph::blasgraph::tropical_gemm
+```
+
+Newer PR-X12 follow-up corrected the current location:
+
+```text
+lance-graph::bgz17::scalar_sparse::tropical_spmv
+```
+
+Treat `blasgraph` as the future abstraction name, not necessarily the current symbol path.
+
+## Responsibility split
+
+```text
+ndarray:
+  numerical kernels
+  EWA/SYRK/MKL/OpenBLAS/AMX backend dispatch
+  3DGS projection and certificates
+  4x4 Block4 carrier math
+
+lance-graph:
+  graph/tile/block orchestration
+  SplatShaderBlas naming and tier selection
+  BLASGraph / bgz17 sparse substrate routing
+  Lance/Arrow persistence
+  query planning
+  certified decision reports
+```
+
+## Unified SplatShaderBlas model
+
+Represent all three tiers under one conceptual interface:
+
+```rust
+pub enum SplatShaderBlasTier {
+    BitpackedPlane,
+    PaletteDistance,
+    Gaussian3d,
+}
+
+pub struct SplatShaderBlasRequest {
+    pub tier: SplatShaderBlasTier,
+    pub source_ref: String,
+    pub query_ref: Option<String>,
+    pub budget_ref: Option<String>,
+}
+
+pub struct SplatShaderBlasDecision {
+    pub tier: SplatShaderBlasTier,
+    pub action: String,
+    pub score: f32,
+    pub confidence: Option<f32>,
+    pub certificate_id: Option<String>,
+    pub reason_codes: Vec<String>,
+}
+```
+
+This should start as a plan-level DTO, not immediate public API.
+
+## Cross-pollination targets
+
+### 1. EWA sandwich propagation
+
+Use the same conceptual kernel across:
+
+```text
+2D cognitive planes
+OSINT path covariance
+3DGS spatial covariance projection
+ultrasound PSF covariance
+raw-field Block4 carrier certification
+```
+
+### 2. Tropical / sparse BLAS planning
+
+Use tropical/spatial BLAS for decision planning:
+
+```text
+tile refinement graph
+CTU / HHTL partition graph
+certificate propagation graph
+query relevance graph
+```
+
+### 3. Palette substrate
+
+Reuse palette/codebook machinery for:
+
+```text
+3DGS Gaussian palette compression
+raw-field kernel block clustering
+attention/KV palette experiments
+genetics/neuron motif blocks
+```
+
+### 4. Certified decision report
+
+All tiers should return reports with:
+
+```text
+source id
+operation tier
+error / confidence / certificate id
+reason codes
+fallback action
+```
+
+## Integration into new 3DGS plans
+
+Patch or reference these plans:
+
+```text
+3DGS-Lance-Arrow-storage-plan.md
+  add SplatShaderBlas tier metadata and certificate links
+
+3DGS-certified-query-render-plan.md
+  include SplatShaderBlas decision tiers
+
+3DGS-4x4-cognitive-shader-integration-plan.md
+  map Block4 carrier to SplatShaderBlas-3DGS
+
+3DGS-epiphany-roadmap-plan.md
+  add CHLOD + SplatShaderBlas convergence path
+```
+
+## Acceptance criteria
+
+- New 3DGS plans clearly reference the older SplatShaderBlas / PR-X12 line.
+- BLASGraph is treated as a future abstraction unless the current symbol exists.
+- Current path `bgz17::scalar_sparse::tropical_spmv` is recorded as the known implementation anchor.
+- The three tiers are named separately to avoid bitpacked/palette/3DGS conflation.
+- Tile/render/query decisions can consume SplatShaderBlas-style reports.
+
+## Demo trajectory
+
+First integrated demo should be deliberately small:
+
+```text
+one 3DGS tile block
+one Lance sidecar
+one ndarray EWA projection report
+one SplatShaderBlas-3DGS decision
+one persisted certificate
+one query asking why the tile was rendered/refined/rejected
+```
+
+This proves the seam without requiring the whole ArcGIS/Cesium stack.