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928a9dfbf7
asmint.asm no longer references any positional temp register name --
every handler and macro declares its temporaries by name with `temp` /
`ftemp` and lets the register allocator place them. Migrate the last
two macros holding out:
* dispatch_current uses a macro-local `opcode` temp for the load8 +
indirect jmp.
* pop_inline_frame_and_resume names its return-pc, dst-index, value-
address, vm-pointer, and executable temps explicitly.
With nothing left referring to the positional aliases, drop the
tN / ftN -> physical-register fallback from registers::resolve_register
and update the DSL reference comments at the top of asmint.asm and in
main.rs to describe the named-temp model. The two pre-existing codegen
tests that probed the old positional behavior get rewritten to use the
post-allocation physical-register names directly, since that is now
the actual contract of resolve_op.