gns/v1 package

Package gns implements GNS (Gno Name Service): an ENS-equivalent naming system expressed as a single Gno-native realm.

The design goal is NOT byte-for-byte ENS compatibility. Instead it provides the same user-facing capabilities (registration, renewal, expiry/grace, forward & reverse resolution, primary names, typed + arbitrary records, subnames with policies, delegated operators, pagination and events) through ONE realm, ONE ownership model, ONE record model, ONE authorization function and ONE registration lifecycle.

Key deviations from a naive port of the spec, forced by gno semantics:

• State-mutating exported functions are "crossing" functions: they take `cur realm` as the first parameter and PANIC (abort) on failure rather than returning an error, because in gno only a panic/abort reverts state. Failures panic with a stable machine-readable code (see the error_* set).
• Persistent, enumerable collections use avl.Tree (ordered, paginatable) instead of Go maps, so every listing API is bounded and cursor-based.
• Names are stored string-native (canonical "label.parent"), not namehashed.

See README.md for the full compatibility statement.