Stabilize native package build verification for RPM/Debian/Arch

[mdheller]

Summary

TurtleTerm PR #3 narrowed Linux Packaging failures substantially.

Current confirmed state on PR #3 head 06390c6202b8e9b708d102e3e1ab5eb7275b95aa:

Green:

• staged Linux package layout validation
• script checks
• native packaging guard inside Script Checks

Still red:

• Linux Packaging workflow native package build/verify jobs for RPM/Debian/Arch

Findings from triage

The original executable-bit failure was fixed by invoking helper scripts through bash in:

• verify-linux-package-layout.sh
• RPM/Debian/Arch verifier scripts
• RPM spec %install
• Debian builder
• Arch builder

Remaining failures occur after metadata/layout validation. The next likely area is mismatch between native package verifier assertions and the staged layout contract, especially around private runtime names under /usr/libexec/turtle-term/.

Acceptance criteria

• RPM package build/verify job passes.
• Debian package build/verify job passes.
• Arch package build/verify job passes.
• Verifiers match the staged package layout contract that already passes in Script Checks.

Related

• PR docs: add CloudShell FOG integration profile (draft) #3: CloudShell FOG integration profile and CI remediation sweep.