fix(evidence): clean Metal nil-pipeline logs

[lalalune]

Summary

• clean whitespace in the On-device local LLM crash-loops on iPhone 16 Pro Max (A18 Pro): NULL Metal pipeline in ggml mul_mat during llama_decode #11612 Metal nil-pipeline evidence logs already merged to develop
• makes git diff --check pass for the checked-in evidence files

Validation

• git diff --check from the follow-up branch
• diff is limited to three files under .github/issue-evidence/11612-ios-metal-null-pipeline/mac-metal-regression/

Notes

No runtime, submodule, UI, native code, or benchmark behavior changes. This only removes trailing whitespace / final blank-line noise from evidence artifacts.

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