build(linux): add hardened Flatpak package - #361
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What changed
Linux gains a hardened x86_64 Flatpak manifest, desktop metadata, local icon, Xwayland-first launcher, and managed-update presentation.
Why
The launcher needs one reproducible installed boundary instead of unsupported tarballs or host-wide filesystem permissions.
Invariant
The package has no home/host filesystem access, no
--no-sandbox, no Wine/Proton path, and runtime trust requires both Flatpak confinement and the exact app ID.Delivery
Review-only package foundation. CI creates an ephemeral signed repository; no public repository is published.
Verification
Flatpak source-policy tests
release-shaped Electron package
GPG-verified local repository install
Focused change
Relevant checks run
No signing key committed