Audit Compiler TODOs, Basics, and Refactor with Best Practices

[Mustafif]

Compiler Analysis and Implementation Audit

This issue aims to:

• Analyze the current state of the MufiZ compiler.
• Review and document all TODO comments and ensure they are fully implemented or scheduled for completion.
• Inspect all basic or placeholder implementations; verify correctness and quality.
• Where applicable, replace basic code with patterns following best practices for Zig and compiler engineering.

Suggested steps:

1. Compile Inventory:

   • Catalog all TODOs and any unfinished functionality.
   • List areas with basic/placeholder implementations (e.g., dummy handlers, stubs, minimal functions).

2. Review Quality:

   • Assess implementation quality for core components.
   • Suggest/replace code using best practices from Zig and general compiler design.

3. Document Actions:

   • Propose a plan for each TODO and basic implementation found.
   • Record links/references to PRs or commits addressing them.

Outcome

• All TODOs tracked and scheduled or implemented.
• Basic implementations improved to match best practices, with rationale documented.

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If any part requires deep Zig expertise or specific compiler design knowledge, involve relevant contributors.