network-quality.yml: suggest-repairs is skipped exactly when the audit finds something to repair

[realmarcin]

Found reviewing PR #316.

suggest-repairs:
  needs: audit-network
  if: ${{ github.event_name == 'workflow_dispatch' && inputs.suggest_repairs }}

A job with needs: is skipped when the needed job fails, and this if: carries no always() / !cancelled(). While audit-network was reporting-only it always ran; now that #316 restored the hard gate, any error-severity finding fails audit-network and skips suggest-repairs.

So the LLM repair-suggestion feature — whose entire purpose is proposing fixes for these findings — can now only run when there is nothing to fix.

Failure scenario: someone lands a dangling downstream.target, then dispatches the workflow with suggest_repairs: true to get suggestions. The job never starts.

Fix: if: ${{ !cancelled() && github.event_name == 'workflow_dispatch' && inputs.suggest_repairs }}.