Fix cursor disappearing and implement Ollama streaming in interactive mode

[Copilot]

Interactive mode had two issues: cursor disappeared after startup, and Ollama responses weren't streamed in real-time.

Changes

Cursor visibility fix

• Removed process.stdin.setRawMode(true) and ANSI cursor manipulation codes from CommandLinePrompt
• Readline's default cursor handling is sufficient and doesn't cause the cursor to disappear

Ollama streaming implementation

• Implemented OllamaAPI.completionStream() using ollama-node's streamingGenerate callback API
• Converts callback-based streaming to async iterator using queue pattern:
  • Chunks queue immediately on arrival, resolve pending promises if waiting
  • Prevents race conditions by queuing before resolving
  • Clears queue on error to avoid stale data

// Stream handler in loz.ts now includes ollama
if (api === "openai" || api === "github-copilot" || api === "ollama") {
  const stream = await this.llmAPI.completionStream(params);
  // ...
  if (api === "ollama") {
    for await (const data of stream) {
      const streamData = data.response || "";
      process.stdout.write(streamData);
    }
  }
}

The async iterator yields {response: chunk} objects compatible with existing streaming infrastructure used by OpenAI and GitHub Copilot handlers.

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