Axiolid restructure: implemented crate map

Implemented from base 372b16f64fa9be962df48751a654f8cda3f3b4a0 under ADR 0035.

Physical ownership

The crate reference lists every package by layer, and the generated crate map and dependency graph give each package's path, role and allowed dependencies. They are freshness-checked by cargo xtask docs --check.

Public migration table

Before	After	Reason
axiolid-scalar / axiolid_scalar	axiolid-reference / axiolid_reference	reference algorithm role, not scalar storage
axiolid-generate / axiolid_generate	axiolid-construct / axiolid_construct	construction semantics instead of vague verb
axiolid-boolmesh	axiolid-mesh-boolean-boolmesh	operation and concrete provider are explicit
axiolid-kernel aggregate	guarantees/common/mesh/operation contract packages plus axiolid-dispatch	portable contracts no longer own runtime policy
axiolid-tessellate	axiolid-tessellation-contract	package already defines a portable seam, not an implementation
axiolid-compile	axiolid-mesh-compile	output result domain is explicit
GeometryCompiler::compile	MeshCompiler::compile_mesh	exact B-rep and discrete mesh results cannot be silently conflated
ScalarCompiler	ReferenceMeshCompiler	reference implementation and output domain are explicit
combined axiolid-field	axiolid-field values + axiolid-field-ops algorithms	representation-only consumers remain light

Facade feature migration:

• kernel is replaced by contracts.
• field is value-only; add field-ops or field-navigation for algorithms.
• pointcloud is value-only: axiolid + axiolid-core + axiolid-pointcloud and nothing else. Add pointcloud-queries for KNN/radius search, pointcloud-reconstruction for the contract, dispatch-pointcloud-reconstruction to select a provider at runtime, or pointcloud-provider for the bundled reference implementation.
• mesh-boolean, mesh-section, and graph-compile expose portable contracts.
• provider selection is opt-in through dispatch-mesh-boolean or dispatch-mesh-section.

Resolved conflicts

• Exact B-rep ownership from ADRs 0020/0024 is preserved. Mesh compilation was renamed rather than generalized falsely.
• The existing default facade remains mesh + cpu; default-feature changes are outside this restructure.
• Source schemas, wire formats, and vendor interpretation remain outside Axiolid geometry packages.
• The neutral packages remain evidence targets for external openbim.geometry capability claims; no Pkl runtime or schema types are carried into Rust contracts.
• Dev-only upward edges are permitted only when explicitly allowlisted for integration/conformance tests; production/build edges still obey the role DAG.

Downstream

openbimrs/ifc's ifc-geometry crate must pin the landed Axiolid commit, retain source-format lowering outside Axiolid, and use the format-neutral authored OpenProfile graph declaration. A facade-only model consumer must continue to work with:

axiolid = { default-features = false, features = ["model"] }

without compiler, provider, field-operation, source-format, or GPU dependencies.

Measurement

Fresh-target cargo check -p axiolid --no-default-features measurements on the same host and Rust 1.88.0:

Feature	Before packages	After packages	Before elapsed	After elapsed
model	17	17	1.915 s	1.915 s
field	5	5	1.781 s	1.815 s
pointcloud	3	3	3.54 s	3.54 s
pointcloud-reconstruction	10	10	4.04 s	4.04 s

The package split changes ownership and compilation units, not external normal-dependency count. This single cold run is noise-equivalent and is not evidence of a performance improvement.