Test polylabel queue tie-break#21
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Compute the polygon centroid seed relative to a local ring origin before translating it back to map coordinates. This isolates the centroid-origin change from the distance-key ordering candidate so it can be tested independently against the submitted PR stack.
Break exact priority-queue ties with existing cell geometry values so equivalent cells are not left to implementation-specific heap ordering. This keeps the local-origin centroid candidate isolated from the broader distance-key ordering change while testing whether the remaining macOS versus Linux/Windows point drift is caused by queue ordering alone.
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Temporary CI branch for the generated-point determinism investigation.\n\nThis stacks the local-origin centroid seed on the submitted PR baseline and adds only a raw-value priority-queue tie-break. It intentionally excludes the earlier distance-key ordering, output rounding, and pruning-key changes so we can test whether the remaining macOS vs Linux/Windows semantic difference is caused by implementation-specific ordering of equivalent queue cells.\n\nLocal build and Liechtenstein generation passed. Local output matches the local-origin-only candidate; the useful signal is the native cross-runner CI result.