Require quickstart support action evidence

[Atomics-hub]

Summary

• strengthen release-ticket quickstart validation so required next actions can include expected action text
• require the support-owner quickstart action to mention deploy/preflight evidence while still pointing at agentk-sidecar-support-bundle

Verification

• cargo fmt --check
• cargo test --locked release_ticket_smoke_inventory_lifts_named_artifacts
• cargo run --locked -- release-ticket --out dist/release-ticket-quickstart-support-action-proof --force --json
• cargo clippy --all-targets --all-features -- -D warnings
• cargo run --locked -- release-audit