docs: add subagent model selection design doc and implementation plan#21

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chinkan wants to merge 11 commits intomainfrom

claude/subagent-model-selection-5OTEa

Commits on Feb 23, 2026

docs: add subagent model selection design doc and implementation plan
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feat(llm): add chat_with_model for per-call model override
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style: fix rustfmt formatting in LlmClient::chat wrapper
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feat(skills): add model/tools/max_iterations fields; subagent skills show metadata-only in system prompt
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fix(skills): conditional newline before subagent section; strengthen mixed-skills test
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feat(skills/loader): parse model, tools, max_iterations from SKILL.md frontmatter
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feat(agent): add read_skill_file tool for reading skill files from skills directory
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fix(agent): read_skill_file symlink escape prevention, rename path->relative_path
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feat(agent): add invoke_subagent tool and run_subagent mini-loop with model override
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feat(agent): add invoke_subagent tool and run_subagent mini-loop with model override
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feat(skills): add thread-writer as example subagent skill
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