Fix glob assignment to correctly alias SCALAR slot for all reference types

[fglock]

Summary

This PR fixes two related bugs involving glob assignments and symbolic references:

Bug 1: Symbolic subroutine reference resolution in wrong package

&{$hash{key}}() was resolving subroutine names in the 'main' package instead of the current package.

Before:

package foo;
my %subs = (test => 'mysub');
sub mysub { print "called\n" }
&{$subs{test}}();  # Error: Undefined subroutine &main::mysub

After:

package foo;
my %subs = (test => 'mysub');
sub mysub { print "called\n" }
&{$subs{test}}();  # Works: calls foo::mysub

Bug 2: Exporter variable export failing for references

*glob = \$scalar was incorrectly checking what $scalar contained and putting it in the wrong slot (ARRAY slot for arrayrefs, HASH slot for hashrefs, CODE slot for coderefs).

This broke Exporter when exporting variables containing blessed objects or references, affecting modules like Test::Specio.

Before:

package Foo;
our $OBJECT = bless {}, 'MyObj';

package main;
*main::OBJ = \$Foo::OBJECT;
print ref($OBJ);  # prints nothing (undef)

After:

package Foo;
our $OBJECT = bless {}, 'MyObj';

package main;
*main::OBJ = \$Foo::OBJECT;
print ref($OBJ);  # prints "MyObj"

Changes

• EmitSubroutine.java: Added isBlockDeref flag to detect &{expr} syntax and call codeDerefNonStrict for all block-style code dereferences when strict refs is disabled
• RuntimeGlob.java: Simplified the REFERENCE case to always alias the SCALAR slot, regardless of what the scalar contains

Test Plan

• All unit tests pass (make)
• Full test suite shows no regressions (74.8% pass rate)
• Test::Specio now correctly exports 40/41 variables (only $UNDEF intentionally undefined)
• Manual verification of edge cases:
  • Blessed objects export correctly
  • Array/hash/code references stored in scalars export correctly
  • Direct \@array and \%hash assignments to globs still work correctly
  • String/integer scalars work correctly

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