scripts: add validate-engine.py per-day oracles (litcal/missalemeum)

Manual QA validators (not run by go test) that build the CLI and compare its
computed calendar/readings day-by-day against authoritative online sources:
  of-calendar  -- OF season/cycle/observed vs the LiturgicalCalendar API (litcal)
  of-readings  -- every OF reading resolves against a corpus (offline)
  ef           -- EF reading gaps + tail/resumed-Sunday gospels vs missalemeum
  ranks        -- OF sanctoral ranks vs litcal

These found the defects fixed in the flawlessness pass; keep them as standing
regression oracles. API responses cache under scripts/.oracle-cache/ (ignored).

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