InfraHub does not support multi-hop relationship traversal in GraphQL
filters, so `bgp_config__device__name__value` fails at query time.
Fix follows the same pattern used for InfraMlagPeerConfig (#22):
add a denormalized direct device relationship to the schema node and
use it in the query filter.
Changes:
- infrahub/schemas/bgp.yml: add `device` relationship (kind: Attribute,
cardinality: one, optional: false) to BGPAddressFamily as the first
relationship, before bgp_config
- infrahub/objects/11-bgp-sessions.yml: add `device: ["<device>"]` to
all 22 InfraBGPAddressFamily entries (spine1×2, spine2×2, leaf1–8×2
each, plus leaf7 and leaf8 VRF gold AF)
- infrahub/transforms/queries/bgp_intent.gql: change filter from
`bgp_config__device__name__value` to `device__name__value`
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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