readings: PartIDs(new) stops declaring aklamacja, which the engine never emits

caldata.go:42 parses only first/psalm/second/gospel out of the lectionary
data, so no OF reading ever carries Part == "acclamation". PartIDs("new")
listed aklamacja anyway, so the app built a checkbox from it that filters
an ID that never appears -- a dead control, same defect class the app
previously shipped for the whole 1962 form.

ofPartOrder stays the full five-ID set: it also drives
render.LocalizeHeading's label matching, where a scraped heading can still
read "Aklamacja" even though this engine's own readings never produce
that section. PartIDs now draws from a new, narrower
ofEmittedPartOrder instead.

Rewrote TestPartLabelsMatchesWhatTheEngineEmits's OF half: it compared
PartLabels("of") to a hand-copied duplicate of ofPartOrder, asserting a
declaration against itself, which cannot fail for this class of bug. It
now sweeps Days over calendar year 2026 and asserts PartLabels("of")
matches the observed part-ID set exactly (0.5s). Confirmed red against
the pre-fix code, green after.

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