[waterflier]

Follow-up from a full sntest VM run (buckyos src/dev_configs/sntest.json, Linux x86_64 host, multipass 1.17). The buckyos side (sntest.json, buckyos.json, build_for_vm_test.py, doc) and the devkit multipass transfer fix are already on main (buckyos 14c43121e, buckyos-devkit 0b58214).

Changes

• dev_configs/web3_gateway_staging.py
  • --target used to default to aarch64 (and apps/web3-gateway.json hard-coded it), so x86 hosts built the wrong arch. It now defaults to the host CPU.
  • The staging build used to run build.py, i.e. buckyos-build + buckyos-update. The latter also updates cyfs-gateway into the host $BUCKYOS_ROOT (/opt/buckyos), overwriting a running local DV's gateway binary. It now runs buckyos-build <arch> and then buckyos-install --app=web3-gateway --target-rootfs=<staging>.
• web3-gateway/scripts/sn-dev-smoke.sh
  • S3/S5: since seed-v2 publishes the OOD-signed documents as-is, /1.0/identifiers/did:bns:* returns a bare application/jwt, so grepping JSON keys always failed. The check now asks for application/did-resolution+json and verifies didDocument plus the expected source (bns_document / auth_db_projection).
  • S7 reset: admin.clear_state_by_active_code is loopback-only on the SN, so in --vm mode it returned 404 from the host. The reset now runs inside the SN VM via buckyos-devtest <group> run sn.
  • S7 read-back: the SN caches DNS answers for 60s and a BNS-proxy publish does not invalidate that cache, so reading back the live TXT within 20s passed only by timing. It now waits at least 90s.
• dev_configs/readme.md: documents the staging build mechanism and the smoke flags needed for the single-node sn_test group (--devtest-group sn_test --no-keep-tunnel).

Verification

• cd src/dev_configs && uv run python -m unittest test_web3_gateway_staging: 13 tests OK.
• Fresh sntest (clean_vms → create_vms → install → start) plus restore installed, update, and stop/start cycles. After each, sn-dev-smoke.sh --vm passed 10/10 and the alice relay through the SN returned 200. Final run used buckyos-devkit 0.7.34 (0b58214) via uv run.
• Not verified: the single-node sn_test group, and the --local smoke mode (S3/S5/S7 logic is shared; local mode still calls the admin reset directly over 127.0.0.1).

Not addressed (noted for follow-up)

• The SN DNS cache is not invalidated when the SN's own BNS proxy publishes dns_txt, so answers can be up to ~60s stale.
• The bns.devtests.org forward logs ERROR Unknown protocol: http even though the request succeeds.
• src/devenv_config.ts has drifted from the buckyos copy: the bns_host field and the vmtest group are missing here.

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