[brett19]

This continues #694, which was closed once #697 merged. #697 ported the face-bound trimmed surface cache, which removed #694's blocker: the 14 IsInnerShell deferrals in topology.topology_traverser. What #694 still adds on top of main is below. The branch is the same one, merged with #697 and the latest main.

Root cause (from #694)

• topology_traverser::is_inner_shell ran its rays and GetPointsInFace on a b.clone() scratch copy, and points_in_face ran CalculateUVDomainFromUVTrimCurves and its iso-line CurveOnClassify on further copies.
• Upstream's const face queries leave the UV trim curves they create on the B-rep, so C++ exported stored trims that Rust lacked. For brep_p6 two_disjoint_cubes, geom.len was cpp 1385 against rust 1232. 18 of 33 trims landed on copies, all of them from is_inner_shell.

Changes

• IsInnerShell, GetPointsInFace and Shell::is_inner_shell take &mut Brep and run on the caller's B-rep instead of a scratch copy.
• The iso-line classification copies the UV trims, tolerance growth and gap caches back from its CurveOnClassifyCache snapshot.
• Traverser runner change, findings entries and unit notes.

Results (local, at a1207b9)

• topology.brep_p6 goes green, 595/595. The 7 region-nesting cases now match C++ bit for bit, Mark2 included, and their known_mismatches.toml entries are removed: two_cubes_at_a_vertex, two_disjoint_cubes, cube_in_cube, cube_with_wire, cube_with_inner_wire, cube_with_inner_vertex, cube_with_outer_vertex.
• Still parked: primitive_creation_p2/skin_concentric_loops (record[7] cpp 1, rust 2) and sweep.api_surfaces/skin_primitive_annular (faces[1] cpp 1, rust 2). Rust builds the annular cap as two faces instead of one face with a hole. Their entries stay, with an updated reason and a findings entry. The cause is not narrowed to a call yet.
• No other count changes: topology.topology_traverser stays 909/909 and topology.shell 911/911. topology.face_p2, query.face_p2, topology.brep_p7, topology.brep_p5, topology.brep_p10 and primitive_creation_p2 match main.

PASS    topology.brep_p6 cases=595 passed=595 failed=0 deferred=0
PASS    topology.topology_traverser cases=909 passed=909 failed=0 deferred=0
PASS    topology.shell cases=911 passed=911 failed=0 deferred=0

Local checks: clippy clean with the cpp feature, and 2085 lib tests pass. CI runs the full sweep.

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