Summary

• Move exec relocation application into Builder and emit fully-relocated .text.
• Drop .rel*/.rela* sections from exec outputs.
• Simplify Writer to use section headers from the builder (no _start injection or relocation).

Details

• Merge .text across inputs, track per-object offsets, and rebase symbols.
• Rebuild .symtab/.strtab and set section header linkage based on final order.
• Enforce a single executable layout (.text at 0x1000, entry at 0x401000).

Tests

• rake test

Checklist

• Switch Linker API to accept multiple inputs.
• Read multiple ELF objects and feed them into a builder.
• Concatenate .text sections into a single output section.
• Preserve non-.text sections from the first input.
• Resolve and validate global symbols (duplicate globals error).
• Apply relocations in builder and drop .rel*/.rela* for exec outputs.