Add experimental probe for build_manifest.py's hardcoded D: venv path

[Wewoc]

Summary

• workflow_dispatch-only, experimental. Checks whether D:\Garmin\.venv_gla (build_manifest.BUILD_VENV_DIR, hardcoded for local dev machines) works on a windows-latest GitHub Actions runner: D: drive presence/writability, venv creation, installing requirements.txt + PyInstaller into it.
• Purpose: de-risk before wiring the real PyInstaller build into a CI workflow (build_all_github.py), same "probe before committing" approach already used for the pytest-qt display question.

Test plan

• Trigger via workflow_dispatch after merge, confirm D:\Garmin.venv_gla is viable

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https://claude.ai/code/session_01JYLx9STTgfo9KXLC2Gog3g

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⚙️ Run configuration

Configuration used: defaults

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Run ID: 33c036f0-a21c-41a0-8db7-c21b5f389d0a

📥 Commits

Reviewing files that changed from the base of the PR and between 0dd0dce and 77283a6.

📒 Files selected for processing (1)

• .github/workflows/build-venv-probe.yml

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