The legacy list_provider_models_request handler was calling
providerRegistry[p].fetchModels() directly, so every client call spawned
the provider fresh (e.g. repeated copilot ENOENT errors). Old clients
still send this RPC.
Route it through ProviderSnapshotManager so simultaneous calls dedupe
through the in-flight warmUps map, cached entries (ready / error /
unavailable) are served without spawning, and at most one spawn occurs
per cwd per TTL window regardless of client count. Direct-fetch path
kept only as a fallback for the null-manager case (tests).
Mohamed Boudra
4b82ca77c8