New public API in register-tx.js:
- TLD_BEACON constant (per Decentralized.DNS/DESIGN-tld-registry.md §3);
keep in step with Argus/src/config.js:TLD_BEACON and the indexer's
BNS_TLD_BEACON_SCRIPTHASH — all three must agree, or clients disagree
about which TLDs exist.
- normalizeTld(input) — validates a bare TLD label (1–16 chars,
[a-z0-9-]), matches bns.js's normalizeTld.
- buildTldRegistrationTx({...}) — mints a per-TLD certificate onto the
TLD beacon. Same shape as buildRegistrationTx (genesis-input rule,
dust accounting, change-at-vout-0) but the payload op is "TREG", the
commitment is the TLD label, and dust flows to TLD_BEACON instead of
the name beacon.
register-entry.js re-exports registerTldWithBuiltInWallet so the
in-browser registrar can drive TLD mints alongside name mints.
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