docs: publish Tend Compose continuity evidence

Export the reviewed allowlisted snapshot from private source commit 07c1655921f21ee5e4fc4d85639d199e8867b17d. This records the Docker Compose activation, schema-compatible rollback, and stateful migration resource findings from Observatory Preview 19 dogfooding.

AI-Assisted: OpenAI Codex
Signed-off-by: Cole Speelman <crspeelman@gmail.com>

examples/server/services/example-site.json

@@ -0,0 +1,29 @@
+{
+  "schema_version": 2,
+  "service": { "name": "example-site", "allowed_host": "example.test", "environment_file": "/etc/tend/environment/example-site.env" },
+  "build": { "package": "./cmd/site", "binary": "example-site", "branch": "main" },
+  "deployment": {
+    "strategy": "singleton_candidate",
+    "root": "/opt/example-site",
+    "lock_file": "/run/lock/tend-deploy.lock",
+    "state_file": "/opt/example-site/tend-state.json",
+    "event_log": "/opt/example-site/deployment-events.jsonl",
+    "health_path": "/healthz",
+    "readiness_path": "/readyz",
+    "candidate_timeout_seconds": 30,
+    "activation_window_seconds": 10,
+    "smoke": [{ "path": "/", "contains": "Example site" }],
+    "public_smoke": [{ "url": "https://example.test/", "contains": "Example site" }],
+    "singleton": {
+      "unit": "example-site.service",
+      "address": "127.0.0.1:8092",
+      "candidate_address": "127.0.0.1:18092",
+      "listen_env": "EXAMPLE_LISTEN",
+      "current_link": "/opt/example-site/current",
+      "previous_link": "/opt/example-site/previous",
+      "caddy_config": "/etc/caddy/Caddyfile",
+      "caddy_handler": "/etc/caddy/example-site-handler.caddy",
+      "caddy_handler_template": "/etc/tend/caddy/example-site.template"
+    }
+  }
+}