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fix(cypher,docs): align knowledge-layer decay docs and diagnostics

Update the installation guide to use the supported knowledge-policy DDL
syntax for decay profile bundles and bindings instead of the old
retention-binding examples.

Make nornicdb.decay.info() report the actual decay-enabled state from the
underlying engine when available, and update its configuredVia text to
reference the supported CREATE DECAY PROFILE forms. Add regression checks
for the procedure output.