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v1.0 docs: HEALPix-ecosystem interchange guideΒ #63

Description

@espg

πŸ€– from Claude

Sub-issue of #48 (v1.0 sweep), Tier-2 docs.

Scope

A guide showing how a mortie packed-u64 morton index interchanges with the wider HEALPix ecosystem:

  • mortie morton ↔ HEALPix (order, nested-pixel) via mort2healpix / norm2mort / mort2norm.
  • Round-trip against cdshealpix / healpy (to_nested/from_nested, ang2pix/pix2ang), the same oracle pattern the test-suite uses.
  • Worked examples and the gotchas (base-cell prefix offset, unsigned vs signed-southern presentation, order self-encoding).

Acceptance criteria

A markdown guide (under docs/) with runnable snippets; cross-checked against the ecosystem libraries already in the test/docs extras.

Refs #48.

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