mars: give L.U.N.A. direct git+tea access to the homelab repo

Provisions a dedicated PR-tier gitea account (luna) with branch protection
restricting master push/merge/approve to darman only, then wires git and
tea directly into the hermes-agent container (mounted from the host's Nix
store, credential-store + tea login set up by a host-side prepare oneshot,
repo cloned inside Hermes's own writable sandbox root at
/opt/data/workspace/homelab). Replaces an earlier standalone MCP-server
approach, scrapped in favor of direct CLI access for simplicity.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011FHr5ug9pu8q4XPrRkFnzJ

secrets/mars.yaml

@@ -4,6 +4,7 @@ tailscale_authkey: ENC[AES256_GCM,data:An+OPDZF9kmemzoDhZPo7yMljksCz3yE/W9I1EAwt
 opencode_go_api_key: ENC[AES256_GCM,data:x7V6iRrP6UMvMAYh/25bcrE10MHhL9lasCYRHiQ3PIDI6aL+uXP0/YpfrRPY+60m5Yv+Bd7+9aWTWdAVu1laSNjJGg==,iv:EmEAig+fSMYX+g77UpkiQ0USxUYOfFWX4WjIj9NA9N8=,tag:Pr+EZW6uDTSGjng8iG2SZw==,type:str]
 telegram_bot_token: ENC[AES256_GCM,data:WX+KFtoqFodkoWNwd7EXUrUJakZ9oaMZgg4OnCeL/JVXcsdQesD1PLmKp6vK9g==,iv:m1oqKlcesvhMLtndyp/XxsUAy0YpEsSulPDK0V+Wh0A=,tag:zvLcxcQ+A4fQUht5GkL2Qw==,type:str]
 hermes_dashboard_oidc_client_secret: ENC[AES256_GCM,data:IMPNTPMKO+b7eyV4hyGfnvH1/i+W4IPDNjncoyB1oIV8WaB6nOJn0sSEuTUCKB94K+Y7bsVQU0zpbKdIYOdGqgmPzwMCsScxMt4SewTmiiqWxv6SQFf4EzMxgXqjMvH8PWDzLcI2C2tI/KcVS251iqRViOTFe1/tkm+mV8sJmEI=,iv:F/rOUDmJZoGPS9fObAni5ntyOqbbhMWDPdHGLTexwlA=,tag:ALf98DmB0JziGspZMiLCiw==,type:str]
+gitea_luna_token: ENC[AES256_GCM,data:EgSgzXFlYHN1yAlpjBBjSxacVYO9mhe1TBtAjNMZDEPxkeizB5O8Bw==,iv:pKN6bz7mBV3HxqBdnJi6ah17bukhd+sXeItojngT0HE=,tag:1wCfPK+MJb+P/S/kq2czeQ==,type:str]
 sops:
     age:
         - enc: |
@@ -24,7 +25,7 @@ sops:
             oyJ7PS3lW+PxH5AZkeeU7gXO/pz2oDku0aDOds7kaD3n0+qSWicQ+Q==
             -----END AGE ENCRYPTED FILE-----
           recipient: age1eapjg6tdrr0fuvmgs3q3nlvnjkaxez298qynqqqxt0lpcv0lrsyq7ayxjk
-    lastmodified: "2026-08-21T23:24:48Z"
-    mac: ENC[AES256_GCM,data:p/vtMVfVWfgP7+xa8sbbdYLeLCYbjvthHoexmKU0RyIl2jv5bp9ldD1F1G8U+v+8+Re44DClcDtoNXrIHlreFx3hbH9sF2tnL4+oI2os7Yn+nmWZ6J1ngS2Hz+qspWtFt+up/TkP2BsTzoas5ZstJckOW0AkeKEYIT1zQmzcBtE=,iv:O2VoZK1DmRSJIR/bC538Ley1fkZqjI0L80YpjUU9mPo=,tag:xO9wzAocmxoxrIHcnBRGXQ==,type:str]
+    lastmodified: "2026-08-22T18:28:46Z"
+    mac: ENC[AES256_GCM,data:Y/QbEoRG2pJ+tz919+kSEfCs6HsjTHmiaO5xWuDhuVXO71Sm+8vx2OQwCnEHWA1FnFoQgBJWJFlAA4yMiFyjtE3Ark9Uxxi07DXYfXJ/B64DBbrxJMQSKVfCxi8KlExbKyL87FSuUwmSeYgE2DIydmOGDv0P+Q0kn5GJ1T6lJOU=,iv:iX9OJMJK3xTsGh8ZLXzZWUj5mZg7jGR3GnvMeR2lXvA=,tag:CvsoVF1vdf4fQmLE3NR9hw==,type:str]
     unencrypted_suffix: _unencrypted
     version: 3.13.3