Resolves review #003 finding M3.
- Add bast_meta::validate_bast_doc and call it from AlkTypeEngine::compile
before parsing. Malformed annotations (unknown endian/encoding strings,
non-integer align/maxLength, missing required properties) now surface as
AlkTypeError::Schema instead of being silently tolerated by the parser.
- Align the meta-schema TypeRef with the parser: allow inline struct/union/
enum as TypeRefs (the parser and builder already accepted them; the
meta-schema and spec did not). Update bast-format.md TypeRef table and
the BastType doc comment to the seven-form vocabulary.
Verification: cargo test --release (410 pass), cargo clippy --all-targets
-- -D warnings (clean), cargo doc --no-deps (clean), cargo build --target
wasm32-unknown-unknown --release (clean).
deepseek-v4-pro
230345a867