docs: correct a stale README

Three claims were false:

The download paragraph said older tags are not offered for download.
They are again -- per-tag snapshots were re-enabled, and only the
summary page's tag list is trimmed. A stable colitur-latest.tar.gz still
exists for scripts that should not know a version.

'Starting with the Roman EF (1962) and OF forms' read as though both
existed. lib/rites/ holds rite_ef and nothing else; the OF is the next
module. The tagline claimed multiple rites for the same reason.

Suite timings were from a much smaller suite: the fast run is ~8s over
568 tests, not ~3s, and the exhaustive sweep ~80s.

Adds a Status section with the real numbers, the five validation layers
and -- more usefully -- what they cannot see, since the differential and
the oracle share one data lineage. Notes that chants are deliberately
absent, and points at the colitur-x viewer.

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