docs(spec): require overlap coherence for d8_raster.v1 entries#3
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Multi-entry hfx.aux.d8_raster.v1 datasets partition one source D8 fabric per basin, but irregular basins do not tile into disjoint rectangles, so entries' axis-aligned extents overlap. The spec did not say what values overlapping entries must carry in the overlap, leaving consumer tile-selection underspecified when more than one entry fully covers a region. Add a normative Overlap Coherence section: overlapping entries MUST report identical flow_dir/flow_acc at each shared cell (they MUST be windows of a single coherent fabric, not independently mosaicked); a producer that cannot guarantee this MUST NOT declare overlapping entries. Consumers MAY then pick any covering entry (e.g. manifest-first), choice-independent. No wire-shape change; format_version stays 0.2.1. Changelog entry added.
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Adds a normative Overlap Coherence section to
spec/aux/d8_raster/v1.md: overlapping multi-entry D8 declarations MUST carry identical flow_dir/flow_acc in the overlap (windows of one coherent fabric), so consumers MAY pick any covering entry. No wire-shape change; format_version stays 0.2.1. Unblocks the shed manifest-first D8 selection fix.