Add a re-runnable interactive wizard that configures an AI provider for the ideation layer: Claude, OpenAI, Gemini, or a local Ollama. Keys persist to ~/.config/nadezhda/credentials (0600, atomic temp+rename) and auto-load on every run; a shell-exported key always wins over the file. A key-name allowlist (NADEZHDA_* / *_API_KEY) blocks env-name injection into spawned subprocesses.
The Ollama path detects a running instance and auto-configures it, else writes an embedded compose file plus one docker command, else prints an install hint. Ollama's host port is remapped to a non-default 39847 (OLLAMA_HOST_PORT) to avoid colliding with an existing Ollama on 11434; the container-internal port stays 11434.
Thread a signal-cancellable root context through cobra (ExecuteContext). Default the Anthropic model to claude-sonnet-4-6.
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