fix: rotate vault unseal keys after vault-0 wipe/reinit

Old root token and unseal keys were dead (lost access to the previous
Vault store). Wiped the S3 backend and vault-0, re-initialized fresh,
rotated these to match the new live unseal keys so ArgoCD's next sync
doesn't clobber them back to the dead ones.

k8s/argocd/secrets/vault-unseal-keys.enc.yaml

@@ -5,9 +5,9 @@ metadata:
     namespace: ENC[AES256_GCM,data:wK6m,iv:KtA31Bo8aGE1HU8H9KWbMwt2NfywWfy77G/LaReaI1E=,tag:V9SSlPawRQw0x2utFNN1aw==,type:str]
 type: ENC[AES256_GCM,data:6UPZ1ZTR,iv:FxN1ebrlJ4IO3eDGEYSvktSpMgAebcl0DO1WHh5O0+0=,tag:2bZN4zdbHzx0oR+bTJPPJg==,type:str]
 stringData:
-    key1: ENC[AES256_GCM,data:dV2HOh7W1Pl0QDJaGvtEKpBppybQMiK5kxzyk05zkA352ZmJvE8Ppm5yWKk=,iv:grQ8v2o/LHpJnIZonjtgTHKcLUQIH8xl1FtWtEs4rEs=,tag:lANcccYT6Ouo/0IcoLw4uA==,type:str]
-    key2: ENC[AES256_GCM,data:YSdpYL8h56PfUrvMFhBXhmBG2en0toLKEpYlJqwjAk/vI0jm7gq/TqGn034=,iv:GxthkNLhm3qHxjkZetiYl58Qa/K7G2ib6E+LWK16H8Q=,tag:q79UUoh6uCcMZJ0U18Ireg==,type:str]
-    key3: ENC[AES256_GCM,data:sO7Lao9qkmIOdARL+6FBcLo+e4z8LzMEzNrwcy5hv9uRuxppwAXrP0MO1vw=,iv:wSWe9h1HovRhV5YCZrmvcB2VEfRYQ+gasGO3uh8IpmQ=,tag:Bc5yaROQDTz1AhVnFDm/BA==,type:str]
+    key1: ENC[AES256_GCM,data:ke5EfsOsZHBJyAQoFfwhhWCQJQgnwcrBqL4CzPIfkx7bi9S7kWgWySdxcXQ=,iv:eYKxG8k+hizp2t2i/YMR2lQNJQFV+A21YyWnDc+kJ9w=,tag:Wa1Lx3EKvfpYfnLrBOWSIg==,type:str]
+    key2: ENC[AES256_GCM,data:JxiXgLKvDe5oiHlwIL/Cj8txHc7fVQ5VzBcQMU/ro9TSOcTGSe7Z3omQzwY=,iv:x5arcY2dey+npMpUxjdUPV+t94LEaMOXq3iOar88eT8=,tag:E/Z5zEDy87B1IAWkdjdNEg==,type:str]
+    key3: ENC[AES256_GCM,data:AsxyyBTHzt+SLru6ayi1UbgPPFmdIvowIDdcfc7N03Xt8V/KaJW3kbXExG8=,iv:lA+bERIBq4+bxx08ZZjP5tMHC9JQlGPW1EMCwEixSeg=,tag:xkuTAU3KTidFuhNMXkVFhA==,type:str]
 sops:
     age:
         - enc: |
@@ -19,7 +19,7 @@ sops:
             7RltNZF2SCxjIv5C2pqf3CgmRBaQGWgMybRRH5gdB87PLBKkPL3+HQ==
             -----END AGE ENCRYPTED FILE-----
           recipient: age1e5fq3hwxy78psus2nfvmtmua36g0u3suk78ephw6246l974d2utsvn0hla
-    lastmodified: "2026-08-12T20:52:24Z"
-    mac: ENC[AES256_GCM,data:kLjoBWmJ2bZ13EbuzgppahHKmCY/xtCi1R7xCEUbCP4FQfiVaC4qAbVftE4lTNlXa2mqCKsGPYZ/A3HV/4+a+it/pg0a+rj7E7DszhieWbZufHMJs+w4/Le8l8wFFE5aNW0wdvGTJZ0n4HBOdAkE1qN9ReaiaQgr0rk5ggOPG9g=,iv:MiDVUgcoKrP/gj4keqomo6OB12dmz9VoesTiHQTnBFM=,tag:cLK67Pym4BuvXLF1RUA8Gw==,type:str]
+    lastmodified: "2026-08-26T23:33:09Z"
+    mac: ENC[AES256_GCM,data:kr8XuOqXyhfrC84yBot5aoVQZZhQd9xYMUEs0XDwkmCgtG0iobADYH5XWPh72xSdWEtwxkZJL7r0UEyEhU9zjlUA5qHupOSBBt1SgZ+zstMvaOqUnlNn//p/DIJBpsiT/qmx64NpTLAiz6lm0796MozIMr8PTX+ubGLHi9tnUiY=,iv:jwP0MLCT7nG6m+nZeqNip9q3BcScpcDXmInnY95DicY=,tag:Cgg2IUZARkaK1gF2qUIthg==,type:str]
     unencrypted_suffix: _unencrypted
     version: 3.13.2