Settle the draw decisions in the renderer contract

- lodGroup links items across sets as one thing at different detail;
  picks name the member shown and report the group. displayRange is
  half-open.
- An orbits capability: the renderer propagates two-line elements with
  SGP4 on the set's motion clock. The stub propagates with satellite.js.
- Height queries see draw sets only with includeInHeightQueries (was
  excludeFromHeightQueries); HeightSample.source gains 'set'.
- courseGlide is a capability; courseBlendMs eases the course on every
  renderer.
- Arc segments climb at climbMps; a negative minDtS stays for the
  aircraft warm-up.
- The star catalogue is optional, a hidden column row keeps its motion,
  and draw.clampState() reports the drape fallback.

Checks cover the climb and warm-up, lodGroup ranges, orbits against SGP4
(with and without motionSegments), hidden rows resuming, and sets not
answering height queries by default.

docs/RENDERER-CONTRACT.md

@@ -154,5 +154,12 @@ Browser checks use the chrome-devtools MCP against a page in its own window.
 The Cesium scene renderer (`src/render/cesium/sceneRenderer.js`) draws the
 icon, point, line, shape, model and city scenes, and the references were
 recorded with it. It has only the members the scenes need. The quad, mesh,
-field and agent scenes have no reference yet. Each family's reference is
-recorded when the Cesium renderer gains that family.
+field, agent and orbit scenes have no reference yet. Each family's reference
+is recorded when the Cesium renderer gains that family.
+
+Some behaviour is only drawn, so the logic checks cannot see it: course
+easing (`courseBlendMs`, `courseGlide`), and a hidden row keeping its eased
+course. The stub keeps no drawn course. These wait for scenes that capture
+an icon mid-turn. Height queries that count a set
+(`includeInHeightQueries`) are not checked either: the stub's heights are
+scripted, so it does not model them.