feat: publish Gamertan Tend preview source

Sanitized root snapshot from private source commit a72903c63e1753f9e6ffbf40453c0830bdfc05c5 and tree 295641e67eef5979da76746d8ae271249568263e. Private development history and workflows are excluded by the exact allowlist.

AI-assisted: OpenAI Codex helped implement, test, and audit this preview.
Signed-off-by: Cole Speelman <crspeelman@gmail.com>

release/tend.json

@@ -0,0 +1,31 @@
+{
+  "schema_version": 1,
+  "service": { "name": "tend", "allowed_host": "localhost" },
+  "build": {
+    "package": "./cmd/tend",
+    "binary": "tend",
+    "branch": "main",
+    "version_symbol": "gamertan.com/tend/internal/version.Version",
+    "commit_symbol": "gamertan.com/tend/internal/version.Commit",
+    "date_symbol": "gamertan.com/tend/internal/version.Date"
+  },
+  "deployment": {
+    "strategy": "singleton_candidate",
+    "root": "/opt/tend-release-test",
+    "lock_file": "/run/lock/tend-release-test.lock",
+    "state_file": "/opt/tend-release-test/tend-state.json",
+    "health_path": "/healthz",
+    "readiness_path": "/readyz",
+    "candidate_timeout_seconds": 5,
+    "smoke": [{ "path": "/", "contains": "Tend" }],
+    "singleton": {
+      "unit": "tend-release-test.service",
+      "address": "127.0.0.1:19090",
+      "candidate_address": "127.0.0.1:19091",
+      "listen_env": "TEND_RELEASE_TEST_LISTEN",
+      "environment": {},
+      "current_link": "/opt/tend-release-test/current",
+      "previous_link": "/opt/tend-release-test/previous"
+    }
+  }
+}