add remove APIs for ELF/Mach-O/PE relocations and relocation sections
allow ELF alloc relocation sections to grow via new PT_LOAD; stabilize section write order
add Mach-O scattered relocs plus weak/lazy bind stream support
add PE COFF relocation helpers (symbol lookup)
update README and tests
- implement relocation add/replace APIs and serialization updates per format
- generate dyld rebase/bind info from Mach-O relocs with optional ordinals
- update ELF dynamic relocation tags and safe relayout handling
- add/extend relocation tests and stabilize existing test suite