Fix foreach-refalias for arrays and hashes (for \@arr, for \%hash)

[fglock]

Summary

Fixes type mismatch bug in foreach reference aliasing where only scalar reference aliasing (for \$x) worked. Array and hash reference aliasing (for \@arr, for \%hash) now work correctly.

Problem

When iterating with for \@arr ([1], [2], [3]):

• Loop elements are array references (RuntimeScalar containing RuntimeArray)
• Loop variable @arr is a RuntimeArray variable
• Code was assigning RuntimeScalar directly to RuntimeArray → JVM verification error

Solution

After fetching each iterator element (RuntimeScalar), dereference it when needed:

• For \@arr: call arrayDeref() to get RuntimeArray
• For \%hash: call hashDeref() to get RuntimeHash
• For \$scalar: keep RuntimeScalar as-is (reference aliasing)

Updated both local and global variable assignment paths in EmitForeach.java to handle the correct types.

Test Results

All foreach-refalias patterns now work:

# Scalar (already worked)
my $x = 42;
for \$x ( \1, \2, \3 ) { say $$x }  # Prints 1, 2, 3
# After loop: $x == 42

# Array (FIXED)
my @arr = (42);
for \@arr ([1], [2], [3]) { say @arr }  # Prints 1, 2, 3
# After loop: @arr == (42)

# Hash (FIXED)
my %h = (k=>42);
for \%h ({k=>1}, {k=>2}) { say $h{k} }  # Prints 1, 2  
# After loop: %h == (k => 42)

All 6 test cases from issue #116 pass:

• ✅ Scalar lexical restored after foreach-refalias
• ✅ Array lexical restored after foreach-refalias
• ✅ Hash lexical restored after foreach-refalias
• ✅ Scalar pkgvar restored after foreach-refalias
• ✅ Array pkgvar restored after foreach-refalias
• ✅ Hash pkgvar restored after foreach-refalias

Build Status

• ✅ All 2012 unit tests pass
• ✅ Build successful with no warnings

Closes #116

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