chore(release): harden v2.3.7 parity and duplicate preflight

[IgnazioDS]

Summary

• advance release-facing metadata to v2.3.7 (changelog/runbook/release docs/demo checklist/Make help/src-tauri package version)
• extend release version consistency gate to enforce apps/desktop/src-tauri/tauri.conf.json package version parity
• add preflight quarantine for untracked duplicate desktop-edge artifacts before duplicate guard in release-check
• set release-tag workflow concurrency cancel-in-progress to false to avoid interrupted publish runs

Validation

• ./scripts/release/check_version_consistency.sh
• ./scripts/release/quarantine_duplicate_pairs.sh
• ./scripts/release/check_no_duplicate_pairs.sh
• make release-check