v0.6.5

Published to crates.io as mfsk-core v0.6.5.

Release notes are auto-generated from merged PRs; see the crate's
CHANGELOG.md
for curated release notes.

Prebuilt mfsk-ffi-ft8 binaries (FT8 C ABI) are attached
below for users who want to drop the decoder into a non-Rust
project without setting up the cross-toolchain themselves —
see docs/EMBEDDED.md
for the integration guide.

What's Changed

• docs: rewrite EMBEDDED.md as deep technical reference + move S3 manual to docs/ + ROADMAP 0.6.4 by @jl1nie in #106
• fix(s3-app/uac): close two disconnect-cleanup race windows from #102 by @jl1nie in #107
• release: bump 0.6.4 → 0.6.5 — crates.io surface refresh + M5StickS3 hero photo by @jl1nie in #108

Full Changelog: v0.6.4...v0.6.5