Remove symbols with no remaining consumer:
- `gateway_name` property on Docker/MacosInfraService — nothing uses it; the
launch flow reads `gateway().name` off the Gateway service. (+ its docker test.)
- firecracker `infra_vm` EGRESS_PORT / SUPERVISE_PORT / GIT_HTTP_PORT — dead
duplicates; launch.py uses supervisor.types / docker.egress / a local const.
- macOS `INFRA_DB_VOLUME` back-compat alias — unused since the DB-volume test
moved to `ORCHESTRATOR_DB_VOLUME`.
- docker `infra.py`: the unused `ORCHESTRATOR_SOURCE_HASH_LABEL` import and the
`__all__` re-exports of the orchestrator constants (consumers import them from
`docker.orchestrator`, not `docker.infra`).
- macOS `infra.py`: the unused `GatewayError` import + re-export.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
didericis
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