Add GLM MoE Metal active expert patches

[i386]

Summary

• add a stacked GLM MoE Metal patch queue on top of the GLM-DSA llama foundation branch
• add active-expert Q3 down kernels and Q2 gate/up dispatch controls for GLM-5.2 style expert tensors
• add selector diagnostics and focused backend/perf tests for selected expert paths

Why

This keeps the GLM MoE performance work separate from the core GLM-DSA architecture and IndexShare support. The branch is stacked so the foundation can be reviewed first, then the active-expert Metal path can be reviewed as the next layer.

Validation

• LLAMA_WORKDIR=/tmp/mesh-llm-llama-moe.bjcGOo scripts/prepare-llama.sh pinned
• just build

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch jd/glm-moe-metal-active

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[github-actions]

This pull request is currently a draft. Reviews will not take place until the PR is marked as ready for review.

[michaelneale]

Approving. Clean stacked patch layer on top of the GLM-DSA foundation — all 12 files are llama.cpp patch files with no Rust/protocol/ABI surface of its own, so zero collision risk with in-flight work. Good stacking discipline keeping the MoE Metal perf work separate from the core foundation.

Note this is gated on its base (#1034, jd/glm-dsa-llama-foundation) merging first — it can't land until then.