fix(ci): use existing snap gateway wrapper

[elezar]

Summary

Fix the snap packaging workflow after the artifact action pin fix in #1855. The snap job now resolves actions/download-artifact, but fails while preparing snap/prebuilt/ because it copies a gateway wrapper from the deleted deploy/snap/ tree.

Related Issue

None.

Changes

• Copies tasks/scripts/snap-gateway-wrapper.sh into snap/prebuilt/openshell-gateway-wrapper, which is the filename expected by snapcraft.yaml.

Testing

• git diff --check passes
• bash -n tasks/scripts/snap-gateway-wrapper.sh passes
• mise run pre-commit passes
• Unit tests added/updated
• E2E tests added/updated (if applicable)

Checklist

• Follows Conventional Commits
• Commits are signed off (DCO)

[elezar]

Seems like a duplicate of #1855

[elezar]

gator-agent

PR Review Status

Validation: this is maintainer-authored, project-valid CI packaging work. It is related to #1855 but not a duplicate: #1855 fixed the actions/download-artifact pin, while this PR fixes the now-stale snap gateway wrapper copy path reached after that workflow proceeds.
Head SHA: 0d7e8f64cfe8184c441cb9df222dfb792fe290ab

Review findings:

• No blocking findings remain. The independent review confirmed snapcraft.yaml expects snap/prebuilt/openshell-gateway-wrapper, and the repository contains tasks/scripts/snap-gateway-wrapper.sh.

Docs: not needed; this is CI packaging workflow repair and does not change user-facing Fern docs behavior.
Checks: OpenShell / Branch Checks is still pending; OpenShell / Helm Lint, DCO, docs preview, and non-applied E2E gates are already green or skipped as expected.
E2E: N/A; no test:* label is needed for this one-line snap workflow repair.

Next state: gator:watch-pipeline

[elezar]

gator-agent

Monitoring Complete

Monitoring is complete because this PR has merged.

Final status: the PR had been under gator:watch-pipeline; it has since merged, so there is nothing left for gator to monitor.

I removed the active gator:* label because there is nothing left for gator to monitor on this PR.