feat(ltk_mapgeo): bucketed geometry builder

[Crauzer]

No description provided.

[Copilot]

Pull request overview

Adds a public builder API for ltk_mapgeo bucketed scene-graph geometry and a comprehensive integration test suite to validate bucketing, packing, and visibility-flag behavior.

Changes:

• Introduces BucketedGeometry::build(...) with BucketGridConfig and BuildError to build bucketed geometry from world-space triangles.
• Exposes the new build API types via scene_graph and crate-level re-exports.
• Adds integration tests covering validation, bucketing behavior, packing/layout, determinism, and visibility flag reordering.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
crates/ltk_mapgeo/tests/build_bucketed_geometry.rs	New integration tests for bucket assignment, packing, validation errors, determinism, and flags handling.
crates/ltk_mapgeo/src/scene_graph/mod.rs	Wires in the new build module and re-exports BucketGridConfig/BuildError.
crates/ltk_mapgeo/src/scene_graph/build.rs	Implements BucketedGeometry::build and defines BucketGridConfig + BuildError.
crates/ltk_mapgeo/src/lib.rs	Re-exports BucketGridConfig and BuildError at crate root.
CLAUDE.md	Adds repository working guidelines and common commands.

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