phi-agent 0.16.0

phi-agent — Rust AI Agent runtime framework: orchestration, sessions, streaming built-in. You define tools, prompts, domain knowledge.
Documentation 
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## What

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## Why

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## Checklist

- [ ] `cargo fmt --check` passes
- [ ] `cargo clippy --all-targets -- -D warnings` passes
- [ ] `cargo test` passes
- [ ] Updated `CHANGELOG.md` under `[Unreleased]`
- [ ] Added or updated tests if applicable