docs: refresh CLAUDE.md for Plan 3

Plans 1-3 are done: the resolution engine, the sanctoral data, and all
five validation layers. Records what each layer CANNOT see, which is the
part a fresh session most needs and the part a green suite hides -- the
lectio differential never compares commemorations and shares colitur's
own data lineage, the oracle is two years wide and never compares
celebration identity, and between them they sleep through commemoration
identity entirely.

Carries into Plan 4 the two behaviour items that all five layers
currently miss (RG 16(a), 5996 wrong days; commemoration identity), the
structural items cheapest to fix before a second rite exists, and the
data defects traced upstream into lectio's generator.

Adds the exhaustive-sweep invocation to the build block: the default
suite samples, so the "clean across every year" claim is reproducible
only on demand.

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