feat(compiler): add baseline optimizations for v0.6.0

[nedanwr]

Summary

Add conservative compiler optimizations for the Kronos v0.6.0 release.

Changes

• Add a dedicated compiler optimization module integrated with bytecode emission
• Fold literal arithmetic, comparisons, boolean operations, unary operations, and string concatenation
• Eliminate unreachable statements after guaranteed control-flow terminators
• Avoid folding expressions that may produce runtime errors, including division by zero
• Remove unnecessary implicit nil returns from terminating functions and lambdas
• Add compiler unit, integration, and LSP diagnostics coverage
• Update the v0.6.0 changelog and mark baseline optimizations complete in both roadmaps

Testing

• All existing tests pass
• New tests added (if applicable)
• Examples updated (if applicable)
• Memory leak checks pass (if applicable)

Documentation

• Examples updated (if applicable)
• README/docs updated (if applicable)

Breaking Changes

None

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/baseline-optimizations

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