fix: make home deletion claimable

[haasonsaas]

Summary

• make delete-home jobs placement-independent at lease selection
• retain tenant, capability, and execution-class scoping
• prove an isolated Sandboxwich worker can claim the asynchronous deletion

Verification

• cargo +1.95.0 fmt --all -- --check
• cargo +1.95.0 check --workspace
• cargo +1.95.0 clippy --workspace --all-targets -- -D warnings
• cargo +1.95.0 test --workspace --no-fail-fast

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