KarpelesLab / goro / 26064738319

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vm: lower \$\$name / \${expr} variable-variable reads natively

Adds OP_VAR_VAR_READ that pops the name expression's result,
coerces it to string, and pushes the looked-up variable's value
via the shared compiler.LookupVarVar helper. Bit 0 of A is the
"warn on undefined" flag; the emit picks it via
VarVarReadIsWriteParent so the AST runVariableRef's Parent-type
switch is preserved at emit time.

resolveName is extracted onto *runVariableRef so the AST runner
no longer carries the name-resolution code inline.

Write side (LHS of \$\$name = …) still goes through the AST's
runOperator + WriteValue path; only the value-context read is
native here.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

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