INFRA.md: document layout

INFRA.md

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+# NetVM Infrastructure Layout
+
+## bl (100.123.153.75) — Main Compute
+- 16 cores, 28GB RAM
+- Roles: Browser automation, NetVM nodes
+- Access: VM -> bl via SSH
+- WARP: Per-node identities in /etc/netvm/
+- Browsers: Headless Chromium via chrome-box
+- API: muse-chat-api.py via netvm-exec (CDP)
+- Hygiene: netvm-reaper.sh
+- Approvals: /etc/netvm/approvals/ + netvm-approve.sh
+
+## VM (34.139.37.135) — Gateway + Vault
+- E2 micro (2 vCPU, 1GB RAM)
+- Roles: Jump host to bl, credential store
+- Credential store: /etc/netvm/meta-credentials/ (age-encrypted)
+- No browser automation (resource constraints)
+
+## Laptop — Dev
+- Roles: Iteration, visible browser debugging
+- Nothing production
+
+## Credential Flow
+- Meta accounts: /etc/netvm/meta-credentials/store.age (VM)
+- WARP identities: /etc/netvm/node.conf (per-machine, root 600)
+- Operators handle transiently; never log values.