Read columns from pg_attribute (format_type with typmod, default expr,
identity, generation, collation) instead of information_schema, which
drops typmods and array element types. Compare relpersistence, RLS
flags and reloptions per table, and require both probes to hold no
functions, non-internal triggers, policies, views, sequences or user
types. Hoist GATEWAY_TABLES so readiness, runtime grants and the parity
test share one table list. Note in the manifest why the relay's
post-pgschema reconcile step does not apply, and point the deployment
doc at schema/.
Signed-off-by: Elrond <28d6302a099e5225b02c4155ac4236e4912603df2ab08dbfc2f4fef08ce598c8@buzz.block.builderlab.xyz>
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