Adds an opt-in pass-through that routes Bun mcp-server requests
to the Go gateway when GO_LAKEHOUSE_URL is set. /_go/v1/embed,
/_go/v1/matrix/search etc. flow through Bun frontend → Go
backend without touching any existing tool. Off-by-default
(empty GO_LAKEHOUSE_URL → 503 with rationale); enabled via
systemd drop-in at:
/etc/systemd/system/lakehouse-agent.service.d/go-cutover.conf
This is the first slice of real Bun-fronted traffic hitting the
Go substrate. The /api/* pass-through (Rust gateway) and every
existing tool are unmodified — fully additive cutover step.
Reversible: unset GO_LAKEHOUSE_URL or remove the systemd drop-in
and restart lakehouse-agent.service.
Verified end-to-end against persistent Go stack on :4110:
/_go/health → {"status":"ok","service":"gateway"}
/_go/v1/embed → nomic-embed-text-v2-moe vectors (dim=768)
/_go/v1/matrix/search → 3/3 Forklift Operators (role+geo match)
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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