[codex] Publish MLPerfTiny examples

[JustinSelig]

Summary

• Publishes the MLPerfTiny suite under app_examples/mlperftiny, sourced from EfficientComputer/apps main at commit 46301721a6da.
• Adds all five MLPerfTiny apps: anomaly detection, image classification, keyword spotting, streaming wake word, and visual wake words.
• Wires the suite into app_examples/CMakeLists.txt and the top-level example listings.
• Adds comprehensive README documentation for the suite and for each individual MLPerfTiny app, covering model files, tensor contracts, build targets, validation behavior, and customization notes.

Validation

• Verified all five app README files plus the suite README are present.
• Verified the copied suite contains the expected 76 source/model/doc files.
• Ran git diff --cached --check successfully after cleaning inherited trailing whitespace.
• Attempted CMake configure from app_examples; local configure is blocked by the current machine's EFF SDK/toolchain setup. Without overrides, SDK setup cannot locate efftools; with local overrides, /Users/justin/effcc/bin/effcc cannot execute on this host.

Notes

• The copied tree preserves the internal source layout, including arm/ reference ports. The E1x build paths use the app CMake files and eff/ sources.