docs: update user guide with v0.3.0 features — multistatic mesh, CRV, QUIC, crates.io
- Test count 700+ → 1,100+, ADR count 27 → 33, Rust version 1.75+
- Add crates.io installation section (cargo add for all 15 crates)
- Add ESP32 multistatic mesh section (TDM, channel hopping, QUIC transport)
- Add mesh key provisioning and TDM slot assignment instructions
- Add CRV signal-line protocol section with 6-stage table
- Update vital signs range for multistatic mesh (~8 m)
- Update through-wall FAQ with multistatic mesh capabilities
- Update ESP32 hardware setup with secure provisioning and ADR refs
Co-Authored-By: claude-flow <ruv@ruv.net>
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