Spec+plan: traditional lectionary (missalemeum) + per-part config

- config: lectionary=new|traditional, traditional_lang=pl|en, and
  commented-out [parts.new]/[parts.traditional] per-part toggles (parsed
  as a map: a part shows unless explicitly false).
- traditional source: missalemeum API (en/pl only; no Latin) mapped to
  the shared []Section; scripture parts get the version-compare via their
  citation + embedded vul, prayers are vernacular-only.
- new internal/tradlit package + Load router by lectionary; plan addendum
  A with the tradlit task and amendments to Section/config/Load/render/cli.

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