Add ens set name command

[gskril]

Summary

• add ens set name <name> to generate ReverseRegistrar.setName calldata
• discover the current ETH ReverseRegistrar from ownership of addr.reverse instead of hardcoding a registrar address
• document transaction-sender semantics and the bidirectional resolution requirement for a functional primary name

Why

The CLI could set a reverse record during registration, but had no standalone command for changing an account's reverse record afterward.

Impact

Callers can now generate unsigned calldata for setting the transaction sender's ETH reverse record. The command returns the resolved reverse registrar alongside to, data, and value.

A reverse record is one half of a primary name. Primary-name resolution is functional only when the supplied name also forward-resolves to the same address.

Validation

• bun run typecheck
• bun test --pass-with-no-tests (repository currently contains no test files)
• bun run build
• git diff --check
• verified command help output
• verified live registrar discovery on mainnet and Sepolia

[pkg-pr-new]

Open in StackBlitz

npx https://pkg.pr.new/ensdomains/ens-cli/@ensdomains/cli@9

commit: 807507b