added opencode zen as provider

providers/registries/zen.py

@@ -0,0 +1,35 @@
+"""OpenCode Zen model registry for managing model configurations and aliases."""
+
+from __future__ import annotations
+
+from ..shared import ModelCapabilities, ProviderType
+from .base import CAPABILITY_FIELD_NAMES, CapabilityModelRegistry
+
+
+class ZenModelRegistry(CapabilityModelRegistry):
+    """Capability registry backed by ``conf/zen_models.json``."""
+
+    def __init__(self, config_path: str | None = None) -> None:
+        super().__init__(
+            env_var_name="ZEN_MODELS_CONFIG_PATH",
+            default_filename="zen_models.json",
+            provider=ProviderType.ZEN,
+            friendly_prefix="OpenCode Zen ({model})",
+            config_path=config_path,
+        )
+
+    def _finalise_entry(self, entry: dict) -> tuple[ModelCapabilities, dict]:
+        provider_override = entry.get("provider")
+        if isinstance(provider_override, str):
+            entry_provider = ProviderType(provider_override.lower())
+        elif isinstance(provider_override, ProviderType):
+            entry_provider = provider_override
+        else:
+            entry_provider = ProviderType.ZEN
+
+        entry.setdefault("friendly_name", f"OpenCode Zen ({entry['model_name']})")
+
+        filtered = {k: v for k, v in entry.items() if k in CAPABILITY_FIELD_NAMES}
+        filtered.setdefault("provider", entry_provider)
+        capability = ModelCapabilities(**filtered)
+        return capability, {}