core/config: default DeepSeek models v4-flash and v4-pro

When preset deepseek omits models, seed deepseek-v4-flash and
deepseek-v4-pro as text-capable entries for selection and docs.

src/plyngent/cli/editor.py

@@ -38,6 +38,11 @@ _MINIMAL_CONFIG = """\
 #
 # [providers.example.models]
 # "gpt-4o-mini" = { text = true }
+#
+# [providers.deepseek]
+# preset = "deepseek"
+# access_key_or_token = "sk-..."
+# # models default to deepseek-v4-flash and deepseek-v4-pro if omitted
 """
 
 

src/plyngent/config/models.py

@@ -58,9 +58,18 @@ class AnthropicProvider(ProviderConfig, tag="anthropic"):
     """Anthropic API provider."""
 
 
+def _default_deepseek_models() -> dict[str, ModelConfig]:
+    """Current DeepSeek text catalog when TOML omits ``models``."""
+    return {
+        "deepseek-v4-flash": ModelConfig(text=True),
+        "deepseek-v4-pro": ModelConfig(text=True),
+    }
+
+
 class DeepseekProvider(ProviderConfig, tag="deepseek"):
     """Deepseek API provider with optional extras (e.g. convention)."""
 
+    models: dict[str, ModelConfig] = field(default_factory=_default_deepseek_models)
     extras: dict[str, str] = field(default_factory=dict)