updateAssetParameters

Replace the live-update layer of the asset parameters on the active session. Applies to future ad breaks — no re-initialization needed.

Highest precedence of the three layers: it overrides both SessionConfig.assetParameters and the manifest's per-asset assetParameters, per key. It replaces the previous update rather than accumulating onto it, matching IMA's replaceAdTagParameters() underneath.

Consumed by GAM pod requests and appended to VAST tag URLs. No-op (with a warning) without an active session.