core/config+cli: recover empty-models providers via models()

Keep empty models as recoverable; promote to ready after remote list or --model.

tests/test_cli/test_provider_recovery.py

@@ -0,0 +1,75 @@
+from __future__ import annotations
+
+from pathlib import Path
+
+import pytest
+
+import plyngent.config
+from plyngent.cli.provider_recovery import ensure_provider_ready, try_promote_provider
+from plyngent.config.models import ModelConfig, OpenAICompatibleProvider
+
+
+def _hollow_store(tmp_path: Path):
+    path = tmp_path / "cfg.toml"
+    _ = path.write_text(
+        """
+[providers.hollow]
+preset = "openai-compatible"
+url = "https://example.com/v1"
+access_key_or_token = "sk-test"
+models = {}
+""",
+        encoding="utf-8",
+    )
+    return plyngent.config.load(path)
+
+
+@pytest.mark.asyncio
+async def test_try_promote_with_seed(tmp_path: Path) -> None:
+    store = _hollow_store(tmp_path)
+    promoted = await try_promote_provider(store, "hollow", seed_model_ids=["gpt-x"])
+    assert promoted is not None
+    assert "gpt-x" in promoted.models
+    assert "hollow" in store.providers
+    assert "hollow" not in store.recoverable_providers
+
+
+@pytest.mark.asyncio
+async def test_try_promote_via_remote(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
+    store = _hollow_store(tmp_path)
+
+    async def fake_discover(provider: object) -> list[str]:
+        del provider
+        return ["remote-a", "remote-b"]
+
+    monkeypatch.setattr("plyngent.cli.provider_recovery.discover_model_ids", fake_discover)
+    promoted = await try_promote_provider(store, "hollow")
+    assert promoted is not None
+    assert set(promoted.models) == {"remote-a", "remote-b"}
+
+
+@pytest.mark.asyncio
+async def test_ensure_provider_ready_already_ready(tmp_path: Path) -> None:
+    store = _hollow_store(tmp_path)
+    ready = OpenAICompatibleProvider(
+        access_key_or_token="sk",
+        url="https://x/v1",
+        models={"m": ModelConfig()},
+    )
+    store.providers = {"ready": ready}
+    out = await ensure_provider_ready(store, "ready", ready, interactive=False)
+    assert out is ready
+
+
+@pytest.mark.asyncio
+async def test_ensure_provider_ready_seed_model(tmp_path: Path) -> None:
+    store = _hollow_store(tmp_path)
+    provider = store.recoverable_providers["hollow"]
+    out = await ensure_provider_ready(
+        store,
+        "hollow",
+        provider,
+        preferred_model="explicit",
+        interactive=False,
+    )
+    assert "explicit" in out.models