docs: fix incorrect shadow model and magnitude convention comments

eclipse.ts: "cylindrical" → "conical" (code implements umbra + penumbra cones)
magnitude.ts: "McCants" → "Molczan" (90° phase reference is Molczan convention)

Author: sandrwich

src/astro/eclipse.ts

@@ -1,6 +1,6 @@
 /**
  * Satellite eclipse (Earth shadow) detection.
- * Uses a cylindrical shadow model — accurate enough for LEO/MEO pass prediction.
+ * Uses a conical shadow model (umbra + penumbra) with linear penumbra transition.
  * No Three.js dependency so it can run in the pass Web Worker.
  */
 import { DEG2RAD, RAD2DEG, EARTH_RADIUS_KM, MOON_RADIUS_KM } from '../constants';

src/astro/magnitude.ts

@@ -6,7 +6,7 @@
  * No THREE.js dependency so it can run in the pass Web Worker.
  *
  * References:
- *   - McCants standard magnitude convention (1000 km range, 90° phase)
+ *   - Molczan standard magnitude convention (1000 km range, 90° phase)
  *   - Kasten & Young (1989) airmass formula
  *
  * Standard magnitude data is fetched at runtime from the satvisor-data mirror