phase: 28_gateway_agent_proxy

**Phase 28 final pass — complete, 100 % green.** All five tasks were already `complete/`; this pass verified the criteria, re-ran the live half, and did the docs pass.

- Gate `bash .agents/validate.sh` **rc=0**: `1650 passed, 15 skipped`, coverage **98.97 %** (floor 94), `ruff` clean, `pyright` **0 errors**, `node --check` clean, hygiene clean (`/tmp/validate-done.log`).
- Live: `pytest -m live --live` **11 passed**; `./scripts/dev-server.sh status` nine sources `ok`; mTLS re-read of `gateway` → agent **1.2.0**, all three sections `available: true`, 6/6 frontends routed, 11 nginx servers + `$targetBackend`, **19** listeners, no core errors (`data/logs/28-finalpass-live.out`); installed agent file byte-identical to this tree (`b0e9ebf1b718…`).
- Criteria: 1 ✅ pytest/coverage · 2 ✅ three sections over a captured tree, `false`/`null` + one `errors` line each elsewhere with `cpu`/`mem`/`disk_io`/`system` intact · 3 ✅ `AGENT_VERSION` 1.2.0 + SCHEMA names all three · 4 ✅ six fixtures verbatim, capture refuses a bad read, 116 socket address columns hold no globally routable endpoint · 5 ✅ gateway runs 1.2.0 and answers over mTLS (transcript `data/logs/28-task05-rollout.md`, `28-finalpass-live.out`) · 6 ✅ validate · 7 ✅ additive: HEAD's 1.1.0 and this 1.2.0 `collect()`ed over one `--root` are key-for-key equal plus the three new sections, `--no-proxy` equal exactly (`data/logs/verify-28-final.py` → 41 PASS, `28-final-verify.out`).
- Docs fixed (README/AGENTS/Containerfile, all re-green): README's opening said "Four dashboards" above a five-row table and said the new sections are "stored in the snapshot" (they are in the **agent's** document — no `/api` payload, no `sample` row, nothing charts them until phase 29); `Containerfile`'s header still said "three dashboards"; AGENTS's coverage figure (98.94 → **98.97 %**), invariant 6 gained the captured-socket-table identifier rule, the agent bullet gained "phase 28 stops at the wire", and the fleet record names the stash-and-compare control plus the volatile listener count. Full record: `data/logs/NOTES-28-final.md`.
- Deviations: none functional; no git index/history touched, phase files untouched (`PLAN.md` and `complete/` unchanged). `uv pip list --outdated` still lists 4 packages (fastapi 0.153→0.161 etc.) — advisory only, dependencies untouched by this phase, left for a deliberate pass.
- Next pending phase: `.agents/phases/todo/29_gateway_dashboard_page/` (the page that consumes these three sections).

tests/fixtures/gateway_nginx_main.conf

@@ -0,0 +1,63 @@
+# Verbatim /etc/nginx/nginx.conf from gateway-ops, read read-only over the ssh key by
+# ./scripts/capture-gateway-config.sh (AGENTS.md invariant 7: verify against the
+# deployed upstream, never guess its shape).
+# Nothing here is rewritten: it is this fleet's ingress map, and the domains in it are
+# the data — an inbound name and the target it routes to are what these config sections
+# exist to report. Key material appears only as the file paths the proxy reads.
+user  nginx;
+worker_processes  auto;
+
+error_log  /var/log/nginx/error.log notice;
+pid        /run/nginx.pid;
+
+
+events {
+    worker_connections  1024;
+}
+
+stream {  
+    include /etc/nginx/stream.d/*.conf;
+}
+
+http {
+    real_ip_header proxy_protocol;
+    set_real_ip_from 127.0.0.1;
+    set_real_ip_from 10.0.0.0/8;
+
+    include       /etc/nginx/mime.types;
+    default_type  application/octet-stream;
+
+    log_format detailed '$remote_addr:$remote_port [$time_local] "$server_name" "$request" '
+                        '$status "$body_bytes_sent" "$http_referer" "$http_user_agent" '
+                        '$request_time "$upstream_addr" "$upstream_response_time" '
+                        '$ssl_protocol/$ssl_cipher';
+
+    access_log  /var/log/nginx/access.log  detailed;
+
+    sendfile        on;
+    tcp_nopush      on;
+    tcp_nodelay     on;
+
+    keepalive_timeout  65;
+
+    gzip  on;
+
+    server_tokens off;
+
+    ssl_protocols TLSv1.2 TLSv1.3;
+    ssl_session_cache shared:SSL:10m;
+    ssl_session_timeout 1d;
+
+    map $http_upgrade $connection_upgrade {
+        default upgrade;
+        ''      close;
+    }
+    server {
+        listen 80;
+        listen [::]:80;
+        server_name _;
+        return 301 https://$host$request_uri;
+    }
+
+    include /etc/nginx/conf.d/*.conf;
+}