v0.4.1 - Native glTF

The main features of the new version:

• The dependency on geoflow is completely removed, and the glTF conversion was ported to Rust.
• Tyler can now read regular CityJSON files, CityJSONSeq files, and the legacy feature-files as input.
• Improved parallelism so Tyler scales better with the available CPU cores.
• Several existing bugs have been fixed in the glTF conversion and tileset generation, so implicit tilesets are fully functional.
• Performance improvements throughout the codebase, resulting in significant speedups.

Added

• Native GLB generation in Rust through cityjson-convert, so Tyler no longer depends on an external geoflow installation for export.
• Optional intermediary tile materialization in CityJSONSeq format for debugging.
• First-class cjindex input support for cityjsonseq, cityjson, and feature-files datasets.
• --include-parent-attributes for 3DBAG/roofer-style parent-child datasets.
• A just ci-check recipe and the GitHub Actions workflow that runs it.
• ADRs and supporting documentation for the cjindex input model, CityJSONSeq exchange, and grid traversal changes.
• A repo-local profiling workflow driven by just profile, scripts/profile-tyler.sh, and Geodepot-backed profile-by-name resolution.
• Per-run profiling artifacts under docs/performance/runs/, including structured summaries for perf stat and Valgrind Massif.
• Retention of raw profiling artifacts and Tyler output under the gitignored docs/performance/runs/raw/ tree for later analysis.
• Runner selection for profiling sessions so perf and Massif can be run independently or together, with failed runs preserved for later inspection.
• A focused CLI/debug regression test suite for intermediary tile preparation, debug data replay, grid export/load, tileset-only runs, and object-attribute mapping.
• A just coverage recipe backed by cargo tarpaulin, plus a recorded baseline under docs/testing/coverage-baseline.md.

Changed

• Tyler now resolves every input through cjindex; the old metadata.city.json + **/*.city.jsonl parser is gone. Tyler now takes a single dataset root input instead of separate --metadata and
  --features arguments.
• Tile-model building now relies on cityjson_lib::ops::merge to reconcile mixed input transforms, so cjindex inputs with differing transforms no longer need local normalization.
• Large cjindex runs are handled in page-sized chunks with thread-local index reuse, which cuts repeated reads during extent and tile processing.
• Grid indexing for cjindex inputs now consumes decoded scan pages directly instead of paging references and issuing per-feature reads.
• Grid vertex counting now accumulates directly into per-cell counts, avoiding per-feature vertex-cell sorting except for thresholded large-feature parallelism.
• Tile conversion now uses thread-local CityIndex handles for cjindex reads and defers normal per-feature cleanup until after tile model merging.
• The CityJSON-to-GLB pre-write path now skips redundant cleanup and filtering work where the GLB output would not change, and records extra timing information around the remaining hot spots.
• Tyler no longer depends on an external geoflow-bundle installation for GLB export.
• For implicit 3D Tiles, tiling is now performed in geographic coordinates.
• 3D Tiles now use region bounding volumes instead of boxes.
• --debug-dump-data now dumps bincode snapshots and intermediary per-tile CityJSONFeature streams under debug/, and RUST_LOG=debug follows the same dump path while also enabling debug logging.
• --debug-load-data now continues to support partial replay from any available subset of dumped debug data, and --debug-load-grid now actively reloads exported grid.tsv and features.tsv data
  for quadtree recomputation.
• The CLI debug/export surface was consolidated: --debug-tile-inputs became --debug-dump-data, --grid-export became --debug-dump-grid, --grid-export-features became
  --debug-dump-grid-features, --grid-file became --debug-load-grid, --3dtiles-tileset-only became --debug-3dtiles-tileset-only, and --geometric-error-factor became
  --3dtiles-geometric-error-factor with the -e shorthand removed.
• --object-attributes now accepts comma-separated name:type mappings and still subsets and coerces CityObject attributes before GLB export.
• --include-parent-attributes now copies inherited parent attributes even when the parent object type itself is not selected.
• --3dtiles-metadata-class now defaults to citymodel.
• When no --lod-* override is supplied, Tyler now keeps the highest available LoD per CityObject by default.
• CityObject type and LoD filtering now run once through the shared cjindex filtering path before extent, grid, tile, and export decisions, so tile bounds and output content use the same retained
  geometry.
• README, Dockerfiles, Nix, and bundled resources were updated for the new pipeline.