README status table moves everything green except the TradeCraft compat
shim (still yellow, documented sunset path). Adds a migration guide
section mapping every old services/cardano_*.py import to its new
cardano_checkout.* equivalent so TradeCraft can adopt in one atomic
diff once the SQLAlchemyInvoiceStore adapter lands.
docs/minting-workflow.md: step-by-step runbook for the cold-signer
pattern — hot host builds UnsignedMint, operator ships three CBOR hex
files to Lucy, offline signer produces a signed tx, hot host submits
via submit_signed_tx. Covers the tx-id sanity check, skey hygiene
rules, time-locked-policy TTL clamp, and the preprod dry-run
requirement for every new policy.
Kayos
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