[AUTOMATED] fix(cli): xrefs --to <import name> answers instead of refusing it as ambiguous

[mahaloz]

The problem

kuna xrefs --to <name> refuses to answer for an import, because an import's
name is on two addresses and the selector model calls that ambiguous — while
either of the two addresses answers the question fine.

$ kuna xrefs decompiler/crates/kuna-analysis/tests/fixtures/pe_imports.exe --to VirtualProtect --json
error: selector "VirtualProtect" is ambiguous; candidates:
  VirtualProtect at synthetic 0x1400079b0
  VirtualProtect at synthetic 0x14000d234
use a section-qualified selector to choose one candidate
$ echo $?
1

$ kuna xrefs decompiler/crates/kuna-analysis/tests/fixtures/pe_imports.exe --to 0x1400079b0
# 2 references to VirtualProtect @ 0x1400079b0
# same import at 0x14000d234 (VirtualProtect) - a forwarding veneer and the pointer slot it jumps through
0x140001a9e	read	__write_memory.part.0+0x18e	CALL qword ptr [0x14000d234]
0x140001cce	read	_pei386_runtime_relocator+0x19e	MOV R12,qword ptr [0x14000d234]

The two candidates are one callable: a .text FF 25 veneer and the .rdata
IAT slot it jumps through. --to has answered over that alias class since
xrefs-unify-pe-import, so both addresses already return the same rows — the
name was the only spelling that could not reach them.

The fix

• A contested name is no longer decided at lookup time. Which addresses are one
  callable is a property of the decoded forwarding jumps, and those only exist
  once the walk has run, so the candidates are carried into the walk as its focus
  set and the ambiguity is settled afterwards against the alias class.
• Candidates that all lie in one class are one callable; the query proceeds at
  the class's code half — the veneer, which is the address the answer is next
  disassembled at — with the lowest address breaking a tie between several
  veneers through one slot.
• Candidates that do not all share a class are distinct functions and keep the
  refusal, with every candidate still named. The fold rests on the decoded jump,
  never on the shared name, so two static duplicate_locals are never merged.
• No option: a read-only query surface commits nothing into the engine and
  cannot change emitted C.

The tests

Three cases in kuna-cli/tests/xrefs_cli.rs: the import resolved by name answers
byte-for-byte what its veneer address answers; puts, reached through the veneer
rather than the slot, folds the same way; and duplicate_local in a relocatable
object is still refused with both candidates. The first two fail without the fix
(exit 1, "is ambiguous"). The acceptance probe is promoted to
tests/cli/name-based-xrefs-rejects.json.

A sweep over every duplicate-name entry in every binary fixture — 148 names in 14
images — folded 129 and refused 18, with every fold answering identically to each
of its own candidate addresses and every refusal naming all of them.

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