tests(mvt): validate Tippecanoe TileJSON parsing, skip indexed tilestats, and enforce maxValues truncation

[ibgreen]

Motivation

• Improve TileJSON test coverage for Tippecanoe-generated metadata by asserting the full parsed metadata, not just the presence of layers.
• Ensure indexed tilestats attributes (e.g. names containing |) are ignored by the parser and do not surface as fields.
• Verify that the tilejson.maxValues option truncates fields[].values as expected.

Description

• Updated test modules/mvt/test/tilejson-loader.spec.ts to load the expected parsed TileJSON via JSONLoader and assert deep equality with the parsed output from TileJSONLoader.
• Added assertions that indexed tilestats attributes are skipped, tilestats properties (like dominantGeometry and minZoom) are merged, and that maxValues truncates values correctly.
• Extended the input fixture modules/mvt/test/data/tilejson/tippecanoe.tilejson to include an indexed tilestats attribute (e.g. scalerank|0) so the code path that ignores indexed attributes is exercised.
• Refreshed the expected parsed output fixture modules/mvt/test/data/tilejson/tippecanoe.expected.json to match the parsed/normalized TileJSON structure used in assertions.

Testing

• Attempted to run formatting via yarn lint fix (required by project guidelines); it failed due to missing node_modules state file in the environment.
• Attempted to run unit tests via yarn test node; this also failed for the same missing node_modules state file.
• The changes are limited to test fixtures and tests; they are ready for CI where dependencies are available and the test suite can be executed.

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[chatgpt-codex-connector]

Assert minZoom only if parser normalizes minzoom

This assertion will fail with the current TileJSON parser because parseTileJSONLayer preserves the original minzoom key from vector_layers and never remaps it to minZoom. As a result, metadata.layers?.[0]?.minZoom is undefined for Tippecanoe input (which uses minzoom), so the new test (and the updated expected fixture that uses minZoom) will fail unless the parser is also changed to normalize the key. If you intend to keep the parser behavior, the test should check minzoom instead or be updated alongside a parser change.

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