Build instructions to create token metadata on-chain
On-chain Metaplex metadata for a mint, or null when the metadata account
doesn't exist yet.
setTokenMetadata pivots create-vs-update on this, so the distinction is
load-bearing: fetchMaybeTokenMetadata returns null for a missing
account but still THROWS on RPC failure. An outage must never read as "no
metadata" — a create against existing metadata fails on-chain and burns
the fee.
Get token info from the mintfx program by token ID
Raw getProgramAccounts for the mintfx program. Each account is matched
against known mintfx account discriminators; unknown discriminators come
back with kind: null.
Build instructions to update token metadata on-chain
The process default:
MINTFX_ENVandSOLANA_RPC_ENDPOINTread at each call.