Find and configure a free model with tool support for subagent tasks

[nev-offload]

Problem

We need a free/zero-cost model that supports tool use for spawning cheap subagents. Currently using kimi-free (openrouter/moonshotai/kimi-k2:free) but OpenRouter returns 404 — no endpoints support tool use for that model.

Goal

Find a free model on OpenRouter (or another provider) that:

• Supports tool/function calling
• Is good enough for routine tasks (GitHub lookups, file ops, simple reasoning)
• Can be used as the default model for low-stakes subagent spawns

Steps

1. Run openclaw models scan to probe free models for tool support
2. Test top candidates with a real subagent task (gh CLI, file ops)
3. Configure as default cheap model for subagent spawns
4. Update MEMORY.md with the working free model

Context

• OpenClaw docs mention openclaw models scan for discovering free models with tool/image probing
• kimi-free doesn't support tools on OpenRouter
• We want to optimize costs by using free models for routine work

Priority

P1 — directly impacts our ability to run cost-effective subagents