The internal_notification rule lived in three stringly-typed places
(_prepare_turn, the queued follow-up, MACHINERY_DISPLAY_KINDS); hoist it to
response_filters.display_kind_for_event(). should_swallow_silence() re-ran
the silence predicate its callers had already evaluated, so reduce it to
is_machinery_display_kind() and drop the try/except staticmethod wrapper
(response_filters has no gateway imports, so a module-level import is safe).
Drop the predicate-only unit test (the integration tests bind the contract)
and sentence-case the fallback like its sibling warnings.
kshitijk4poor
d4acb74d04