Merge branch 'ef-rg16a': RG 16(a), RG 111(b), RG 113, and commemoration identity

Closes the largest known-wrong-output item on record (RG 16(a): a Feast
of the Lord occurring on a II-class Sunday leaves the Sunday
uncommemorated -- 5996 wrong days over 1583-9999) together with RG
111(b)'s rank floor on the day it holds, and gives the oracle layer the
ability to compare commemoration identity rather than only presence and
count.

Also corrects a methodological defect that had produced wrong rulings in
both this project and its sibling: docs/research/ holds an electronic
transcription alongside two photographic scans, and the transcription
silently drops commemoration lines -- seven across the year. Reasoning
from its silence had convicted the oracle wrongly on 14 August and
ruled a genuine 9 August commemoration spurious. The scans are the
primary source; the rule is now recorded at the top of the register.

RG 113 replaces an alphabetical same-rank tie-break that had no
rubrical warrant. A bare Commemoratio has no row in RG 91's table at
all, so band no longer hands one the entry of a III-class universal
feast: 4451 days, all four reordered pairs verified against a
photographic scan, zero observed-day changes.

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