Task 092: Episode-Aware Brachistochrone Calculator

Status: DONE

Motivation

The interactive brachistochrone calculator (calculator.js) currently has only EP01 presets, but it appears on every episode page. Each episode involves different transfers with distinct distances, transfer times, and conditions. Adding episode-specific presets would let readers explore the parameter space of the episode they're viewing.

Scope

1. Add per-episode presets to calculator.js covering key transfers from each episode
2. Pass the current episode number from the template to the calculator
3. Show the relevant presets for the current episode, with a way to see other episodes' presets
4. Add TS tests for the template changes

Episode Transfer Summary (for presets)

• EP01: Mars→Ganymede 3.68 AU 72h (canonical), 150h route, mass scenarios (48t, 4800t, 48000t)
• EP02: Jupiter escape (brachistochrone 27h), Jupiter→Saturn 7.68 AU ballistic 455d (not brachistochrone)
• EP03: Enceladus→Titania ~10.6 AU 143h, navigation error 99.8%
• EP04: Titania→Earth 18.2 AU 65% thrust, plasmoid shielding
• EP05: Uranus→Earth composite route 507h total, nozzle lifespan 55h38m

Dependencies

• calculator.js (existing)
• templates.ts renderCalculator() + renderEpisodePage()
• report-types.ts (no changes expected)