Subprocess wrapper for `gemini -p --output-format stream-json --yolo`
that spawns the Gemini CLI and parses NDJSON events (init, message,
tool_use, tool_result, result) into a structured GeminiResult.
Includes 10 unit tests for parseGeminiJSONL covering happy path,
malformed input, empty input, missing fields, and multi-tool scenarios.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Garry Tan