launchers: default LOOP_TIER to 'go' — zen endpoint dead server-side, silently ate the 2026-09-18 weekly report

nix/modules/cc-ci.nix

@@ -92,15 +92,13 @@
       User = "loops"; Group = "users";
       WorkingDirectory = "/srv/cc-ci";
       # Optional per-run overrides for backend/model (LOOP_BACKEND, LOOP_MODEL, OPENCODE_SHARE,
-      # UPGRADER_ARGS, …). The leading "-" makes it optional: absent file → claude/sonnet defaults.
-      # Current config (as of 2026-08-16): the upgrader + report run on tinfoil/deepseek-v4-pro
-      # (LOOP_MODEL + REPORT_MODEL in the env file); the hourly SUPERVISOR stays on glm-5.2
-      # (SUPERVISOR_MODEL defaults to opencode-go/glm-5.2 in launch-supervisor.py, NOT overridden
-      # here). Subagents bind deepseek via the cc-ci repo's opencode config. LOOP_TIER=zen is kept
-      # so the tier check passes; the watchdog's usage-limit probe sends the deepseek model name to
-      # the zen endpoint, which returns 200 (not 429) → resume immediately (correct: tinfoil has no
-      # rolling usage limit to wait out). No rebuild needed to switch — the env file is read at each
-      # timer fire. Holds no secrets (the tinfoil API key lives in the opencode config / auth.json).
+      # UPGRADER_ARGS, …). The leading "-" makes it optional: absent file → the in-code defaults,
+      # which are opencode + LOOP_TIER=go (the only tier with a key on this host; ZEN models are
+      # dead here — the in-code default is 'go' for exactly that reason, see launch-upgrader.py).
+      # Current config: LOOP_TIER=go with LOOP_MODEL / REPORT_MODEL / SUPERVISOR_MODEL all
+      # opencode-go/glm-5.3-flash (upgrader, report, supervisor). Subagents bind deepseek via the
+      # cc-ci repo's opencode config. No rebuild needed to switch — the env file is read at each
+      # timer fire. Holds no secrets (the API key lives in the opencode config / auth.json).
       EnvironmentFile = "-/srv/cc-ci/upgrader.env";
     };
     environment = { HOME = "/home/loops"; };