v0.2.0

Other

• Merge remote-tracking branch 'origin/main' into perf/p1.1-allocation-audit
• add justfile for a fast, multi-threaded local dev loop
• (stream) [breaking] encode Matter qb64 in-place, ~51% faster
• (deps) realign digest to 0.10 to collapse duplicate crypto stack

Changed

• (stream) BREAKING: matter_to_qb64 now returns Result<Vec<u8>, ParseError> instead of Vec<u8>. It Base64-encodes directly into the output buffer via encode_slice, removing an intermediate String and a padding reallocation, and replaces a release-compiled-out debug_assert with a real length-invariant check. SerderError gains a Qb64Encoding(ParseError) variant. Encode throughput improves ~51% (Ed25519 qb64: 84.7 ns → 41.8 ns, now faster than decode). (#28)

Other

• (deps) realign digest to 0.10 to collapse a duplicate crypto stack in the shipped tree (drops digest 0.11, crypto-common 0.2, hybrid-array)