Align startup validation with POST-only routes

Co-Authored-By: Codex <noreply@openai.com>

Author: Pigbibi

scripts/validate_cloud_run_startup.py

@@ -59,9 +59,9 @@ def validate_startup() -> None:
     }
     required_routes = {
         "/health": {"GET"},
-        "/run": {"GET", "POST"},
+        "/run": {"POST"},
         "/dry-run": {"GET", "POST"},
-        "/probe": {"GET", "POST"},
+        "/probe": {"POST"},
         "/monitor-dispatch": {"GET", "POST"},
     }
     missing_or_invalid = {

tests/test_cloud_run_startup_validation.py

@@ -1,4 +1,10 @@
+import sys
 from pathlib import Path
+from types import SimpleNamespace
+
+from flask import Flask
+
+from scripts import validate_cloud_run_startup
 
 
 ROOT = Path(__file__).resolve().parents[1]
@@ -12,3 +18,22 @@ def test_production_startup_validation_is_a_ci_and_image_build_gate():
     assert command in dockerfile
     assert "Validate production Cloud Run startup" in ci_workflow
     assert f"uv run --no-sync {command}" in ci_workflow
+
+
+def test_startup_validation_accepts_post_only_execution_routes(monkeypatch):
+    app = Flask(__name__)
+    for index, (path, methods) in enumerate(
+        {
+            "/health": ["GET"],
+            "/run": ["POST"],
+            "/dry-run": ["GET", "POST"],
+            "/probe": ["POST"],
+            "/monitor-dispatch": ["GET", "POST"],
+        }.items()
+    ):
+        app.add_url_rule(path, f"route_{index}", lambda: "ok", methods=methods)
+
+    monkeypatch.setattr(validate_cloud_run_startup, "_install_smoke_environment", lambda: None)
+    monkeypatch.setitem(sys.modules, "main", SimpleNamespace(app=app))
+
+    validate_cloud_run_startup.validate_startup()