Use api.config?.pythonPath in grok_agent_plugin.ts instead of hardcoded python3

[Copilot]

grok_agent_plugin.ts hardcoded spawn("python3", ...), breaking environments that use a venv or non-standard Python path — unlike grok_swarm in index.ts, which already respects api.config?.pythonPath.

Changes

• src/plugin/grok_agent_plugin.ts
  • Add DEFAULT_PYTHON constant pointing to skills/grok-refactor/.venv/bin/python3 (same venv default as index.ts)
  • Resolve Python executable via api.config?.pythonPath || DEFAULT_PYTHON before spawning

// Before
const child = spawn("python3", args, { ... });

// After
const DEFAULT_PYTHON = join(PLUGIN_ROOT, "skills", "grok-refactor", ".venv", "bin", "python3");
// ...
const pythonPath = api.config?.pythonPath || DEFAULT_PYTHON;
const child = spawn(pythonPath, args, { ... });

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