Qualcomm AI Engine Direct - add Windows-on-device execution support to Device (formerly SimpleADB)

[chenweng-quic]

Summary

• Device (renamed from SimpleADB) now dispatches to either ADB (existing Android/OE-Linux over-adb behavior, restored) or the new LocalBridge (Windows-on-Snapdragon, where the CLI runs on-device already, so file staging is a local copy and commands run through PowerShell instead of adb shell), selected automatically from --target.
• SimpleADB -> Device rename is mechanical across all call sites; two call sites that reached into the now-removed private _adb were migrated to the existing public pull/pull_heap_output methods.
• Updated READMEs / skill doc that referenced SimpleADB by name, and a couple of docstring lines that said "android device".
• Review order: backends/qualcomm/export_utils.py has all the actual logic
  (DeviceBridge/ADB/LocalBridge, library naming per target, Device.init);
  everything else is the SimpleADB -> Device identifier rename plus two
  call sites that were reaching into the now-removed private _adb method.

Test plan

python "backends\qualcomm\tests\test_qnn_delegate.py" -k "test_qnn_backend_abs" `
>> --soc_model SM8850 `
>> --build_folder "build-arm64-windows" `
>> --target aarch64-windows-msvc

Authored with Claude Code (Anthropic).

cc @cbilgin @psiddh

[pytorch-bot]

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⚠️ 21 Awaiting Approval

As of commit 795e03c with merge base 91d26b3 ():

AWAITING APPROVAL - The following workflows need approval before CI can run:

• Build Aarch64 Linux CUDA Wheels (gh)
• Build Aarch64 Linux Wheels (gh)
• Build documentation (gh)
• Build Linux CUDA Wheels (gh)
• Build Linux Wheels (gh)
• Build macOS Wheels (gh)
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• Cadence Build & Test (gh)
• Lint (gh)
• periodic (gh)
• pull (gh)
• Test ARM Backend (gh)
• Test CoreML Backend (gh)
• Test Cortex-M Backend (gh)
• Test NXP Backend (gh)
• Test QNN Backend (gh)
• Test QNN Windows MSVC build (gh)
• Test Vulkan Backend (gh)
• Test WebGPU Backend (gh)
• Test XNNPACK Backend (gh)

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