emperor-folder 0.1.0

MCP server confined to one folder: list, read, search, stat, write, edit and move files, never outside the root
Documentation 
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## What changes

<!-- One or two sentences: what the change does and why. -->

## Checklist

- [ ] `cargo fmt --all --check`, `cargo clippy --all-targets -- -D warnings`, `cargo test` and `cargo deny check` pass
- [ ] A change to path handling or a new path argument has a case in the escape tests
- [ ] Docs updated: `README.md`, `AGENTS.md`, `manifest.yaml` (tools, flags), `CHANGELOG.md`
- [ ] Every commit is signed off (`git commit -s`, [DCO](https://developercertificate.org/))