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Triggered by issue #22 (firefox-7 SxS mismatch reported on Win11 26200 by jannusdorfer-create). Verifies the shipped binary launches cleanly on every Windows runner GitHub offers: windows-2022, windows-2025, windows-latest, across Python 3.11 / 3.12 / 3.13. Each cell does the reporter's exact flow: fresh checkout, pip install from source, python -m invisible_playwright fetch, then runs the InvisiblePlaywright(seed=9128) snippet. If all cells pass the bug is environment-specific to the reporter (corporate edition, EDR, GPO). If any cell fails the same way we ship a sidecar mozglue.manifest in the next release. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>