Tablet 45: the courtyard gate checks the key, not the shape of the header

/courtyard/* and /chatzer/* admitted any `Authorization: Bearer <x>`.
Every test sent `Bearer test-token`; none sent a wrong one. Every
admitted request spends the day's manna.

VavPipeline.BigdeiKodesh.Gate: keys are a file (Construction §4.6 —
never env, never config, never git), one `tier key` per line, tiers
courtyard < chatzer (the inner ring opens the outer). Constant-time
compare against every line; no file / empty / unreadable → nobody
passes, GATE_NO_KEYS in the log, the caller told only "missing or
invalid". 403 FORBIDDEN for an outer key at an inner gate. Read on
every request so a rotated key is live in ~1 min without a rollout.

Deploy: Secret shorashim-api-keys projected at
/etc/shorashim/secrets/api_keys (vav-pipeline only, 0440),
API_KEYS_FILE in the configmap, template + issue/rotate recipe in
secrets.yaml and KOHEN.md "Issuing a key". Spec: tamid §1.1 (gate,
403), vayakhel §4.6. Doorpost 91d09d8d… → 42b38626….
Tests: tablet45_gate_test (parse, tiers, wrong/near/empty/no key, no
file) — Elixir 527/0.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

vav_pipeline/config/runtime.exs

@@ -30,6 +30,8 @@ if config_env() == :prod do
       System.get_env("TALMUDIC_SOCKET_PATH") || "/tmp/shorashim/talmudic.sock",
     korban_socket_path:
       System.get_env("KORBAN_SOCKET_PATH") || "/tmp/shorashim/korban.sock",
+    # The keys themselves are in the file (a mounted Secret), not in env.
+    api_keys_file: System.get_env("API_KEYS_FILE") || "/etc/shorashim/secrets/api_keys",
     # Shoresh Engine binary — VavPipeline.ShoreshEnginePort opens an
     # Erlang Port with {:spawn_executable, binary}, which spawns a CHILD
     # PROCESS OF THIS CONTAINER. A Port cannot cross a container