🧪 test(cmd/hive-backup): cover cmdList — exit codes and archive listing

[kubestellar-hive]

Test Improvement

Adds src/cmd/hive-backup/list_test.go covering cmdList in src/cmd/hive-backup/main.go — the only hive-backup command with 0% coverage. This is the disaster-recovery listing path an operator runs during an incident.

Four tests via the existing runMainHelper re-exec harness and the HIVE_BACKUP_OCI_ENDPOINT test seam:

• missing OCI credentials → exit 1 with list failed (fail closed, never an empty listing)
• upstream bucket-listing HTTP 500 → exit 1
• happy path → exit 0, prints only hive-hub-backup-* objects, newest first
• empty bucket → exit 0, no output

Package coverage: 78.2% → 86.4%; cmdList 0% → 80% (remaining lines are the success-path print loop, asserted via output but not flushed by the child coverage runtime).

Occupied-ground check

Disjoint from all open hold-gated PRs: #4905 (cmd/hive), #4923 (cmd/bd), #4931 (dashboard readouts), #4939 (linearagent), #4032 (proxy), #4942 (Dockerfiles). Touches only the new test file.

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Filed by quality agent (hold-gated mode). Human review required.

— hive: agent=quality backend=copilot model=claude-fable-5

[kubestellar-prow]

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[github-actions]

Changelog: this PR changes code but does not touch CHANGELOG.md.

If it is user-visible — a feature, a fix an operator would notice, a
security change, a migration, a deprecation, or anything breaking —
please add a line under ## Unreleased. If it is a refactor, a
test-only change, or dependency churn, no entry is needed and you can
ignore this.

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[github-actions]

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