Stop telling the reader that the moons drawn without a map were never imaged

provenanceFor ended every derived surface with "Not an observation — no image of this world
exists", a sentence written for exoplanets. The branch added eleven solar-system bodies with no
map in the catalogue, and eight of them are moons spacecraft photographed: Voyager 2 imaged
Miranda, Ariel, Umbriel, Titania, Oberon, Proteus and Nereid, Cassini Hyperion (26 Sep 2005, from
about 500 km). The textures README says so itself. Hubble sees Eris, Haumea and Makemake too, as
points.

Only an exoplanet now gets that sentence. A moon or dwarf planet drawn from its measurements says
"no global map of this world is used here", which is true of all eleven. Read off the live pages:
Titania, Hyperion and Eris end with it, and an exoplanet keeps the old wording.

Controls: giving every derived surface the exoplanets' sentence fails "says a moon without a map is
illustrated, without saying it was never imaged"; giving it to none fails "says an exoplanet has
never been imaged".

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/app/features/body-detail/body-view-model.spec.ts

@@ -72,6 +72,19 @@ describe('buildBodyViewModel', () => {
     expect(bodyReadouts(buildBodyViewModel('luna', catalogues)!).provenance).toContain('Orbit: JPL SSD satellite mean elements, epoch 2000 Jan 1.');
   });
 
+  it('says a moon without a map is illustrated, without saying it was never imaged', () => {
+    // luna has no map under that id. Voyager and Cassini photographed every moon drawn this way.
+    const provenance = bodyReadouts(buildBodyViewModel('luna', catalogues)!).provenance;
+    expect(provenance).toContain('Not an observation — no global map of this world is used here.');
+    expect(provenance).not.toContain('no image of this world exists');
+  });
+
+  it('says an exoplanet has never been imaged', () => {
+    const exoplanet: ExoplanetRecord = { id: 'x', hostStarId: SUN_STAR_ID, hostStarName: 'Sol', name: 'X b', orbit: { semiMajorAxisAu: 0.05 } };
+    const model = buildBodyViewModel('x', { bodies: [], exoplanets: [exoplanet], stars: [sun] })!;
+    expect(bodyReadouts(model).provenance).toContain('Not an observation — no image of this world exists.');
+  });
+
   it('marks a published exoplanet period as measured, not derived', () => {
     const exoplanet: ExoplanetRecord = {
       id: 'kepler-22-b',