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>

deploy/k8s/deployment.yaml

@@ -76,6 +76,13 @@ spec:
         # vav-pipeline, which spawns it as an Erlang Port.
         - name: shoresh-bin
           emptyDir: {}
+        # The courtyard keys, as a file (Construction §4.6). Only
+        # vav-pipeline mounts it. Absent → the pod waits at
+        # ContainerCreating, loudly; there is no "open gate" fallback.
+        - name: api-keys
+          secret:
+            secretName: shorashim-api-keys
+            defaultMode: 0440
 
       # --- POD SECURITY CONTEXT ---
       # Every image runs as the non-root user `shorashim` (uid/gid
@@ -221,6 +228,9 @@ spec:
             # directory both live under it.
             - name: tmp-shorashim
               mountPath: /tmp
+            - name: api-keys
+              mountPath: /etc/shorashim/secrets
+              readOnly: true
             - name: shoresh-bin
               mountPath: /opt/shoresh
               readOnly: true