v1.7.1 — p1 follow-up ops + clean-headers xcframework

Follow-up to the OCCT 8.0.0p1 upgrade (v1.7.0).

New operations

• BRepGraph durable identity — TopologyGraph UID/RefUID/ItemUID accessors (persist-safe IDs).
• Surface.networkSurface (GeomFill_NetworkSurface) and Surface.gordonReport (Gordon Status/approximate-fallback).
• Polygon2D.copy(), PolygonOnTriangulation.copy()/setNodes()/setParameters().
• BRepGraph reads now real: faceSameDomain, face/edge adjacency + shared-edges, faceIsNaturalRestriction; and the vertex-supplement ops (faceAddVertex/edgeAddInternalVertex/faceRemoveVertex/faceNbVertexRefs) backed by BRepGraph_LayerTopoSupplement.

Packaging fix

The v1.7.0 xcframework accidentally bundled 18 stale OCCT 8.0.0-GA headers (a CMake install-prefix that wasn't cleaned between builds) that p1 removed/renamed — harmless (no symbols in the lib) but misleading. build-occt.sh now wipes the install prefixes each run; this xcframework contains only real p1 headers. See the CHANGELOG for details (incl. why there is no graph-level edge-regularity API in p1).

Binaries

• OCCT.xcframework.zip — OCCT 8.0.0p1, clean headers (what Package.swift resolves).
• OCCT-8.0.0-GA.xcframework.zip — previous GA binary, for the transition.

Staying on GA: pin OCCTSwift ≤ v1.6.3 (resolves GA from the untouched v1.3.2 release).

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