v0.2.2 — README polish + fully English codebase

Small maintenance release on top of v0.2.1. No behavior change.

Docs

• README header now shows all 9 rank emblems (Bronze → Mythic)
  instead of a curated subset of 5.
• The Roadmap is now a structured TODO with four buckets
  (Done / Planned / Ideas / Ongoing) — easier to see what's shipped
  and what's coming next.

Codebase cleanup

• CLI (src/index.js) fully translated to English, including number
  formatting (en-US).
• All remaining French comments and messages translated across the
  engine, CSV parser, Hevy client, env loader, catalog script, and
  the web app.
• Engine GROUPS labels and reference lifts translated to English
  (Jambes → Legs, Pectoraux → Chest, Dos → Back, Épaules → Shoulders,
  Bras → Arms, Abdos → Core).
• French keywords inside GROUP_COEFFS are intentionally kept so
  French-locale Hevy exercise titles keep matching.

Under the hood

• No engine, ranking, or UI behavior changes — everything computed
  the same way as v0.2.1.

Full details in CHANGELOG.md.