chore: sync repository quality assets

[lightning-it-shared-assets-sync]

Automated sync from lightning-it/shared-assets-lit.

This PR updates:

• Lightning IT release-model metadata and documentation
• repository-quality workflow
• guarded Renovate automerge workflow and policy
• fail-closed Copilot review gate and review instructions
• trusted Codex-to-Copilot remediation workflow and prompt
• exact-head human or MLX-90 Security promotion authorization
• private-safe OpenSSF Scorecard workflow
• repository-quality validation scripts

This bootstrap PR targets develop. Once
develop exists and is protected, normal sync PRs target develop.

[lightning-it-shared-assets-sync]

{"app_id":4351516,"schema":"lit-shared-assets-sync-provenance/v2","source_job":"Sync repository-quality assets to documentation","source_repository":"lightning-it/shared-assets-lit","source_run_attempt":1,"source_run_id":32332051490,"source_run_url":"https://github.com/lightning-it/shared-assets-lit/actions/runs/32332051490","source_sha":"e56a454c83f9bff46b5a0433a0f4b93913fc3e19","source_workflow":".github/workflows/sync-repository-quality-repos.yml","target_base_sha":"7226abf68784090c60335929d1d3ed363f2f1dc4","target_head_sha":"ab7670c80b637e01e74d04aa2b720819195da540","target_pr":218,"target_repository":"lightning-it/documentation","target_tree_sha":"2478fc87a074ebd30db97e877d9a4ef0aa23457e"}

[lightning-it-shared-assets-sync]

Superseded by #219, the newer verified run-bound synchronization PR. The immutable source branch is retained as evidence.