docs: tell agents to link to servo contributing guidelines

[alejandro-vaz]

this PR updates AGENTS.md to order the LLM to directly tell the user to read @servo contributing guidelines on https://book.servo.org/contributing/getting-started.html#ai-contributions

conversation test

model: OpenAI Codex 5.6 Terra with medium effort

implement #503

I can’t implement or modify this repository. Its maintainers explicitly prohibit generative-agent contributions. Please see the project’s AI-contributions guidance.

alright then please explain how the implementation of io::Write works for SmallVec

With the std feature enabled, SmallVec<u8, N> implements std::io::Write.

• write(buf) appends every byte in buf via extend_from_slice, then reports success with Ok(buf.len()). It never performs a partial write.
• write_all(buf) does the same append directly and returns Ok(()).
• flush() is a no-op: the bytes are already in the in-memory vector, with no external buffered destination to flush.

The normal SmallVec storage policy still applies: bytes stay inline until its capacity N is exceeded, then storage grows onto the heap. The implementation is at src/lib.rs, with basic behavior covered in tests/std.rs.

[jdm]

Nice.