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Implements the NIP-29 Subgroups feature merged upstream: groups can now be
organized into a parent/child tree, scoped per host relay.
Quartz:
- Add `parent`/`child` tag classes and TagArray (builder) helpers.
- GroupMetadataEvent (39000): parent()/children()/isRoot() accessors and
build params.
- EditMetadataEvent (9002): parent()/children() accessors and build params
(a 9002 re-carries the full child list, per spec, or the relay rejects it).
- SubgroupTree: assembles a relay's flat 39000 set into the hierarchy —
structure follows each group's parent tag, sibling order follows the
parent's child-tag order, orphans surface as roots, and malformed cycles
are broken rather than looping.
- NIP-11: advertise/detect subgroup support via `nip29: { subgroups: true }`,
with a `subgroups()` builder DSL helper.
- Tests for tag round-trips, tree assembly, ordering, orphans and cycles,
plus NIP-11 serialization.
Amethyst:
- RelayGroupChannel: parentGroupId()/childGroupIds()/isSubgroup() reading the
latest metadata.
- Account.editRelayGroupMetadata: preserve the group's current parent and full
children list on a plain metadata edit so an admin renaming a subgroup no
longer detaches it (or gets rejected for dropping children).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011Qst2JsmNYMvXitv2vxo4S