tap namespace list omits non-default/local hubs and does not identify hub source

[jlrickert]

Summary

tap namespace list appears to list memberships only from the selected/default hub. It omits namespaces represented by other configured remote and local hubs, and its output does not identify which hub supplied each row.

Reproduction

Tapper version:

tap version 0.32.0

Configured hubs:

$ tap hub list
* atlas remote  https://atlas.foldwise.ai                 user
  homelab remote  https://jlrickert.int.foldwise.ai       user
  topos-local local                                        user

Observed output:

$ tap namespace list
@foldwise       org     owner
@jlrickert      user    owner

Actual behavior

Only the memberships returned from the selected atlas hub are shown. There is no hub/source column, so rows cannot be attributed when multiple hubs are configured.

Expected behavior

tap namespace list should aggregate every namespace the current user belongs to across all configured usable hubs. It should also represent local namespaces that own or contain locally available KEGs, even though a local hub does not have remote membership records.

Each row should identify its source hub so identical namespace names on different hubs remain distinguishable.

A useful output shape would include at least:

NAMESPACE   KIND   ROLE   HUB

Acceptance criteria

• Query all configured usable hubs, not only the selected/default hub.
• Include remote namespace memberships from atlas and homelab.
• Include local namespaces represented by KEGs on local hubs such as topos-local.
• Include the source hub in every row.
• Keep same-named namespaces from different hubs distinguishable.
• If one hub is unreachable, preserve results from other hubs and report the failure with that hub name.

[jlrickert]

Partially addressed in #92.

Done: aggregation across every configured remote and readonly hub, a HUB column on every row, same-named namespaces on different hubs kept distinct, and per-hub failures reported by name while the remaining hubs still list.

Not done: local namespaces. There is no local hub kind in the code. pkg/tapper/config.go defines only HubKindRemote and HubKindReadonly, and every resolver rejects anything else, so a hub configured as local has no supported surface to enumerate. Representing locally-backed namespaces needs that kind to exist first, which is a larger change than the listing fix.

Leaving this issue open for that half.