feat: initial release of ucobs 0.1.0

μCOBS — Consistent Overhead Byte Stuffing encoder/decoder.
no_std, zero-alloc, spec-compliant (Cheshire & Baker 1999).
44 tests + doctests, property-based testing, fuzz targets,
cross-validation against corncobs.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,5 @@
+/target
+/fuzz/target
+/fuzz/corpus
+/fuzz/artifacts
+Cargo.lock