fix(shot): plausible SECRET_KEY_BASE 62→68 chars — Phoenix cookie store requires >=64 bytes, so EVERY HTML render 500'd (the real cause of screenshot:null on all runs; /api/* unaffected which is why tiers passed). Default capture now lands the real registration page; verified: shot-fix-plausible run install=pass, screenshot.png 64132B real form, no hook needed

tests/plausible/functional/test_health_check.py

@@ -12,8 +12,10 @@ from harness import http as harness_http  # noqa: E402
 def test_plausible_root_serves(live_app):
     """GET /api/health → 200 (clickhouse+postgres ready).
 
-    `/` itself 500s via auth_controller under DISABLE_AUTH, so it is NOT a
-    reliable health probe; the dedicated /api/health endpoint is.
+    `/` is NOT a reliable health probe (500s during datastore init; 302s to
+    /register once ready — and 500'd permanently under the pre-2026-06-11
+    62-char SECRET_KEY_BASE, see recipe_meta.EXTRA_ENV); the dedicated
+    /api/health endpoint is.
     """
     url = f"https://{live_app}/api/health"
     status, _ = harness_http.retry_http_get(url, expect_status=(200,), max_wait=60, interval=3)