Add post-BAST-pivot code review (#003)
Covers the whole crate after the BAST pivot: correctness, code smell,
panic safety, and coverage (cargo-llvm-cov). 3 Medium findings (field-
level endian override ignored, aligned-mode validate_bytes broken for
arrays/maxLength/offset-indirect, meta-schema never applied at compile
time), 2 Low (offset-indirect dead code, dead endian param), 4 Nits.
Timestamp removal recorded as a publisher decision, tracked separately.
Verification: cargo test --release (389 pass), cargo clippy --all-targets
-- -D warnings (clean), cargo llvm-cov --release (90.14% lines / 86.68%
functions).