Hashnode metrics availability

Hashnode publishing is fully supported, but reading post analytics requires a Hashnode GraphQL query that isn't integrated into Signal yet. Until it is, Hashnode metrics are marked Unavailable with that explanation, rather than estimated.

"Unavailable" is deliberate and honest: the data exists on Hashnode's side, but Signal won't display a number it can't verify through an integrated source. When the analytics query is wired up, Hashnode will move to a verified state.