Update a resource using a right-sizing hint

Applies a right-sizing recommendation from GET /simulations/{simulationId}/right-sizing-hint to the targeted resource in one call. Pass the affectedResourceId and recommendedSlug from the hint response; the server validates the slug against the resource's available sizes before mutating anything.

Validation: Returns 400 UNKNOWN_SIZE with a list of valid slugs if recommendedSlug is not recognized for the resource's provider and type — so callers can pass the hint slug directly without a separate size lookup.

Supported resource types: compute, database, storage (any provider). GPU node-count hints (gpu-underutilized, gpu-saturated) and managed-API breakeven hints (gpu-api-breakeven) produce non-slug recommendedSlug values and cannot be applied via this endpoint. SQL Server Express databases are also excluded: their instance class and CPU-credit billing configuration must remain consistent. This route returns 400 UNSUPPORTED_RESIZE without changing the simulation for those resources.

Cross-provider alternatives: DigitalOcean slugs returned as cross-provider alternatives in right-sizing hints are accepted for non-DO resources; the resource's cost characteristics are updated to the DO tier without changing the provider field.

Requires write scope and ownership.