[AdaWorldAPI]

SAP research probe (planning only)

Adds a scoped, unimplemented / preregistered lab plan: .claude/plans/d-qr-sap-classview-projection-probe-v1.md.

Scope: source-field permutations, BAPI and hash projections; direct masks vs QR64/256; no SAP writes.

Mapping proposal: Reuse the existing lance_graph_contract::class_view::{ClassView,FieldMask,WideFieldMask} structural field basis at the binder/DTO boundary, rather than minting a new mapping vocabulary. A WideFieldMask is a field presence selector and does not itself encode a relationship, permission, identity or graph adjacency.

Execution research: bounded QR64 = 512 B / QR256 = 8 KiB per Boolean adjacency tile when demand warrants; original borrowed SoA lanes and index/prefetch sidecar are additional. Reuse Quack/mask-RISC/ndarray kernels, not a second graph engine. Source-specific tests include independent oracles, mutation/refusal controls and an adoption cost gate.

Shared baseline: lance-graph #1659 physical borrowed lanes; #1660 algebra/elimination/proof research; EXO-119 missing positional wrapper; EXO-120 QR algebra probes; EXO-50 board coordination.

Gates: ADMISSION B (#1640) prohibits foreign-value-directed cross-table gathers even during preparation. Preserve stable field ordinals, source versions, authorization, original row positions, set/bag and Boolean/GF(2)/numeric domain separation. No production API or behavior change; no tests or benchmarks run by this docs-only PR.

The capstone PR will cross-reference this independently reviewable topic PR.

Capstone, Linear and handoff

This SAP probe belongs to the five-PR capstone lance-graph #1663 and is tracked on EXO-122. Its results/claim requests belong in EXO-50. The capstone uses existing ClassView/WideFieldMask as field mapping, not an inferred relation/permission; this PR remains independent and docs-only until a separate lab implementation is authorized.

Capstone rail extension: D-QR-ABI-0 specifies existing 6×(PART_OF8:ISA8) facet coordinates and proposed separate HHTL16 16×8 logical zippers. Added a SAP-specific negative oracle to this PR's plan: source field ordinals are not inherently ISA/PART_OF edges; never infer a relationship from WideFieldMask presence. See EXO-122.

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