Add comprehensive feature analysis and issue tracking for all backends

[Copilot]

Analyzed all 9 backends (DirectX, Metal, CUDA, HIP, GLSL, SPIRV, Rust, Mojo, Slang) to identify implemented vs missing features across parsers, lexers, and bidirectional code generation. Created actionable documentation for 60+ missing features.

Documents Created

• FEATURE_ANALYSIS_SUMMARY.md - Executive summary with critical gaps and priorities
• FEATURE_MATRIX.md - Feature support tables comparing all backends
• ISSUES_TO_CREATE.md - Detailed descriptions of 60+ issues ready for GitHub creation
• ANALYSIS_README.md - Maintenance guide for analysis documents
• NEXT_STEPS.md - Phased implementation roadmap

Critical Findings

Missing Test Coverage:

• CUDA: 0 tests (both backend and frontend)
• SPIRV: 0 tests (both backend and frontend)
• HIP: 0 backend tests
• GLSL: 0 frontend tests
• Slang: 2 frontend tests only

Missing Language Features (All Backends):

• Enums (only HIP has partial support)
• Templates/Generics (not supported anywhere)
• Type aliases/typedef
• Classes (only HIP, Mojo partial)

Control Flow Gaps:

• While loops: Missing in Metal, Slang
• Switch statements: Missing in HIP, Rust, Slang
• cbuffer support: Incomplete across most backends

Issue Breakdown

Priority	Count	Timeline
Critical	5	Immediate
High	15	1-2 sprints
Medium	25	1 quarter
Low	15+	As time permits

Current test status: 508 tests, 100% passing. All issues are for expanding functionality, not fixing broken features.

Original prompt

Go through all functionalities that is completed for all backend(DirectX, metal etc) and everything that is completed on frontend and create new issues for everything that needs to be done

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