In the with_mongot_extension_* suites (SERVER-130648), the mongot-extension provides $vectorSearch and featureFlagExtensionsInsideHybridSearch is off. $rankFusion/$scoreFusion pipelines containing $vectorSearch should be rescued by the IFR kickback: LiteParsedRankFusion calls search_helpers::throwIfrKickbackIfNecessary, which throws IFRFlagRetryInfo(featureFlagVectorSearchExtension) so runAggregate's retry loop re-runs the command with the flag disabled per-operation, using the legacy $vectorSearch.

Empirically the kickback does not rescue these commands:
- The kickback error surfaces to the client: commands fail with '$vectorSearch-as-an-extension is not allowed in a $rankFusion pipeline.' (suggesting the throwing lite-parse happens outside the retry scope on some path, or a router-side path lacks the retry loop).
- In other runs, commands fail post-retry with the legacy-side validation '$rankFusion input pipelines must not contain $vectorSearch because it modifies or transforms the input documents', as if the retried parse still carries extension stage properties.

~16 hybridSearch tests are excluded in buildscripts/resmokeconfig/matrix_suites/overrides/with_mongot_extension.yml because of this; grep this ticket number to find them. They should be re-enabled when the kickback works -- independently of, and before, enabling featureFlagExtensionsInsideHybridSearch (SERVER-130878).

Repro: buildscripts/resmoke.py run --suites=with_mongot_extension_single_node --force-excluded-tests jstests/with_mongot/e2e/hybridSearch/ranked_fusion_test.js