fix(installer): hoist tarball var to script-global so EXIT trap is safe

[chr1syy]

Summary

PR #33 fixed the RETURN-trap leak on \$staging. Re-running the v0.1.1 installer in a sandbox surfaces the same scoping bug on the EXIT trap for \$tarball — the local declaration is gone by the time the trap fires when main returns, and set -u prints tarball: unbound variable after "Install complete".

Promoting tarball to a script-global RELEASE_TARBALL alongside the existing RELEASE_BACKUP is the smallest fix that keeps both success and failure paths clean.

Test plan

• Pre-flight: ran patched install.sh in /tmp/relay-fresh3, install completes silently with no trailing warning
• Existing tests still pass on main baseline (no test code touched)
• After merge: tag v0.1.2, run fresh-install dry-run against the published tarball, confirm no unbound variable warnings end-to-end

🤖 Generated with Claude Code

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Reviewing files that changed from the base of the PR and between 8f5331e and 617f165.

⛔ Files ignored due to path filters (1)

• package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (2)

• install.sh
• package.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/installer-tarball-trap

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