call-actor/get-actor-run don't expose Actor run cost

[jirispilka]

call-actor and get-actor-run fetch the Actor run object, which includes usageTotalUsd/usageUsd from the Apify API, but these are only attached to the MCP _meta field (com.apify/ActorRun), never to structuredContent. Most MCP clients (and the model) only see structuredContent, so the run cost is effectively invisible after calling an Actor.

get-actor-run-list already puts usageTotalUsd directly in structuredContent per item (actorRunListItemSchema), so the three tools are inconsistent.

Verified locally via mcpc @stdio tools-call call-actor: the raw response has

"_meta": { "com.apify/ActorRun": { "usageTotalUsd": 0.00005 } }

but structuredContent.stats only contains runTimeSecs, computeUnits, memMaxBytes — no cost.

Affected: call-actor, get-actor-run (both default and widget response variants).