IntegrationCatalog.add_catalog and remove_catalog re-validate the
existing catalog entries' priorities inline, separately from the base
loader. Both did `int(raw_priority)` under `except (TypeError,
ValueError)`, so a `priority: .inf` (float('inf')) raised OverflowError:
add_catalog leaked a raw traceback instead of IntegrationValidationError,
and remove_catalog crashed while building the display order.
Add OverflowError to both handlers, matching the base loader (#3525) and
the workflow/step loaders (#3526). add_catalog now raises
IntegrationValidationError; remove_catalog falls back to positional order
like the other non-integer priorities.
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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