No Dynamic Allocation

lob never allocates from the heap and never throws. Builders stage into an inline buffer, tables are borrowed rather than copied, and the integration state is a small fixed footprint.

The motive is callers the library author never meets: embedded targets and real-time contexts that forbid heap use, and integrators who want to vendor the library with no allocator hooks. The consequence is a caller contract (borrowed tables must outlive the build) stated on the builder surface rather than hidden.