example config: opencode profile uses the verified zero-credential free tier

The commented CB-402 block suggested google/gemini-2.5-pro, which needs
credentials. Replaced with the opencode/*-free gateway models proven during the
dogfood to work with no auth at all, and noted that the free model names change
so `opencode models` is the source of truth.

bridged/bridged.example.yaml

@@ -89,12 +89,17 @@ workers:
   # SubscriptionGuard (so it needs no `guard` host entry), no --mcp-config / --append-system-prompt.
   # The bridge MCP + reply charter mount via a generated OPENCODE_CONFIG file, and the model is a
   # `provider/model` selector. Placement, tabs, cwd, and the readiness gate are shared with Claude.
-  #   opencode-gemini:
+  #
+  # Dogfood-verified 2026-07-29 against opencode 1.18.5 (spawn → readiness gate → bridge_send →
+  # structured bridge_reply → teardown). The `opencode/*-free` models run on opencode's own gateway
+  # and need NO credentials — check `opencode models` for the current free list, since the names
+  # change. That also makes the worker off-subscription by construction.
+  #   opencode-free:
   #     kind: opencode
-  #     model: google/gemini-2.5-pro   # opencode `provider/model` selector, injected as `-m`
+  #     model: opencode/north-mini-code-free  # `provider/model` selector, injected as `-m`
   #     placement: tab
   #     workspace: bridged-workers
-  #     tabLabel: "opencode: {model} #{n}"
+  #     tabLabel: "opencode: {profile} #{n}"
   #     mcpUrl: http://127.0.0.1:8765/mcp
   #     argv: ["opencode"]
 defaultWorker: gx10