[Alex0420W]

…ping

NASA restructured the Artemis program in February-March 2026:

• Artemis III is now an Earth-orbit test mission
• Artemis IV (early 2028) is the first crewed lunar landing at the south pole
• Lunar Gateway canceled in March 2026

Updates the project's framing to reflect the new mission designation. The methodology, data, and validation are unchanged. The candidate landing regions identified in NASA's October 2024 down-selection remain the validation reference.

Adds Lawrence 2025 (NTRS 20250008952) as a reference and a new Methodology sub-section mapping selene-base's seven criteria to NASA's Figures of Merit categories. Specific NASA FOM weight values are not publicly disclosed; selene-base implements physics-driven analogs of the documented FOM framework.

Surgical scope:

• README: opening tagline, headline blockquote, Engineering decisions bullet, image alt text, Roadmap "Note on mission designation (April 2026)" framing block, new v1.5.1 roadmap entry, new "Mapping to NASA's Figures of Merit framework" Methodology subsection, Lawrence 2025 added to References.
• docs/v1.5_catalog_report.md: lead-paragraph mission designation fixed; new FOM-mapping note added to Section 2.
• Source docstrings + viz labels (cli.py, pipeline/validate.py, criteria/coupling.py, criteria/los_to_earth.py, validation/init.py, validation/nasa_regions.py, validation/sensitivity.py, viz/webmap.py, viz/site_report.py).
• tests/test_webmap.py: assertion updated to match webmap label.

Intentionally not changed:

• Citation titles ("Gracy & Lee 2024 Update on the Artemis III Reference Mission", "Down Selected Artemis III Candidate Landing Site Navigational Grids", NASA Oct 2024 announcement URL slug artemis-iii) — citations are fixed.
• Wueller 2026 paraphrasing in README, the v1.5 catalog report, the validation/wueller_comparison.py module docstring, and the bundled Wueller 2026 README — Wueller wrote under the Artemis III framing, which was correct at time of publication.
• Historical Roadmap entries (v0.x — v1.4) — covered by the new "Note on mission designation (April 2026)" framing block at the top of the Roadmap section instead of backdating the historical record.
• Plot-rendering code (notebooks/, pipeline/coupling_sweep.py plot title) and bundled PNG plot images — touching them would require regenerating images that this release explicitly does not refresh.

Manual follow-up: update the repo About description from "Artemis III" to "Artemis IV" via the GitHub web UI (gh CLI workflow scope is not granted on this host).

Summary

What this PR does, in 1–3 sentences.

Motivation

Why this change is worth making (link the issue if there is one).

Checklist

• ruff check . passes
• ruff format --check . passes
• pytest passes locally
• New behaviour has a test (or an explicit # noqa reason if not)
• Public-facing changes (CLI flags, criterion math, file layout) are
  reflected in the README or the relevant module docstring
• No real-data fixtures were committed; new tests run in CI without
  downloaded data (or are guarded with pytest.mark.skipif)

Scope notes

• Things this PR explicitly does not address (so reviewers know what
  to expect in follow-ups).