refactor: Split BytecodeCompiler and fix glob slot access

[fglock]

Summary

This PR includes two improvements to the interpreter:

1. Fix glob slot access (*X{HASH}): Interpreter now correctly handles glob slot access like *X{HASH} in eval STRING, matching baseline compiler behavior
2. Refactor BytecodeCompiler: Split large BytecodeCompiler class into focused, maintainable classes

Changes

Glob Slot Access Fix

• Added GLOB_SLOT_GET opcode (230) for direct glob slot access
• Modified handleGeneralHashAccess() to detect *X{key} patterns
• Implemented executeGlobSlotGet() in SlowOpcodeHandler
• Test improvement: re/reg_namedcapture.t now 1/2 passing (was 0/2)

BytecodeCompiler Refactoring

Extracted compilation logic into specialized classes:

• CompileOperator: Operator compilation (die, eval, require, package, etc.)
• CompileBinaryOperator: Binary operator compilation (and/or, ternary, etc.)
• CompileBinaryOperatorHelper: Helper methods for binary operators
• CompileAssignment: Assignment and declaration compilation

Changed private fields to package-private for refactored class access:

• symbolTable, sourceName, sourceLine
• bytecode, variableScopes, allDeclaredVariables, capturedVarIndices

Code Organization

• BytecodeCompiler reduced from ~9700 lines to ~4000 lines
• New classes total ~4700 lines with clear responsibilities
• Same bytecode generation behavior, improved maintainability

Test Results

• ✓ All unit tests pass
• ✓ Compilation succeeds
• ✓ re/reg_namedcapture.t: 0/2 → 1/2 passing

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