[AdaWorldAPI]

Summary

Implements D-LANESOCK-1 from the merged spec (#1966, .claude/plans/d-lanesock-dr-dt64-lane-socket-v1.md). The code lives in lance-graph-dt64 (src/lane.rs). The crate still depends only on the zero-dependency contract crate.

• LaneSource, implemented by the source owner.
  • It maps (classid, SchemaRev, field position) to a LaneAddr: the lane, its CoordSpace (whose row order the lane is in) and the reader Scope it serves.
  • It lends its own lane through an associated type (type Lane<'a>), for example mask-RISC LaneRef. dt64 never names mask-RISC.
• BindStore::bind_lanes (cold), producing a LaneBinding that holds addresses only.
  • It checks the frame against its FrameStore.
  • It checks the route at the requested version, and against the store's current version.
  • It checks the basis at SchemaRev, then takes one lane per field of the WideFieldMask.
• LaneBinding::check / lane (hot, no allocation). They re-check route, frame, basis and mapping, then borrow the lane.
• Versions are a pair. The route is checked against BindStore's own log, the frame against the FrameStore that issued it. No merged clock is introduced.

Refusals: the existing Refusal and FrameRefusal arms, plus:

• RouteChanged, FieldNotInBasis, Unbound;
• CoordinateSpace: a lane in another row order than the selection;
• Scope, MappingChanged, Vanished, NotBound.

Not changed: no store, clock, GUID index, writer or per-row DTO. The Gather ban, ADMISSION B, NotASide, OP-14, DRISA M1/M2 and D4/S-INGRESS are untouched. Cross-space reads refuse; no mapping is admitted.

Proof

lance-graph-dt64/tests/lane_socket.rs (8 tests):

• two fields of one ClassView basis are bound and borrowed; ptr::eq shows the lanes are the source's own slices, not copies;
• the CoordinateSpace refusal, and that the same field binds under its own row order;
• wrong SchemaRev and a changed basis;
• a field outside the basis, and an unbound field;
• a foreign scope;
• a changed mapping, and a vanished lane;
• a foreign frame, and a stale frame (MapChanged);
• a re-route under an unchanged frame, which refuses both on use and on rebind.

dir-sim lab, tests/ordinal_chain_lab.rs (4 new tests, 19 total):

• The Ruler-plane selection in AD slot space, AD-owned department and cost-centre lanes bound through one basis and one WideFieldMask. Over three seeds:
  • a DT64-admitted MethodRef (its reads names the lane) drives Agg::SumI32;
  • the same binding drives confirmed ∧ cost > 150 → Agg::Count;
  • both equal the independent scalar scan oracle;
  • anti-vacuity: the count is strictly between 0 and the number of confirmed slots.
• An Entra-order lane under the AD selection is refused with CoordinateSpace.
• After the source reorders its rows and advances the frame, the old binding refuses (CoordinatesChanged), and a rebind under the new frame works.
• 64K slots: 0 hot allocations over 200 passes of check + borrow + fold.

Disable runs (committed first, each guard removed, then restored); each turns its named test red:

• coordinate-space guard;
• scope guard;
• mapping-changed guard;
• route check in check;
• frame check in check;
• basis guard.

Measured (release, 64K slots; reported, not gated)

	cost
check + borrow	34–140 ns
check + borrow + SumI32 over a 64K i32 lane	~12 µs (the fold reading 256 KB of values)
hot allocations	0

Checks run

• cargo clippy -p lance-graph-dt64 --all-targets -- -D warnings: clean.
• cargo test -p lance-graph-dt64: all green.
• Lab clippy (-D warnings): clean. Lab tests: 19/19. fmt: clean.

Board

• STATUS_BOARD.md: D-LANESOCK-0 Shipped (plan: D-LANESOCK — DR × DT64 property-to-lane socket and joint version witness #1966), D-LANESOCK-1 In PR.
• The LATEST_STATE.md contract-inventory line is added after merge, per that file's convention.

---

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-11-06T08:56:39.270510Z	7ac4254	Draft marked ready

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