mirror.md: added section 8 covering the 4-step UI wizard flow, wizard
vs env var comparison table, and air-gap bundle import via UI and CLI.
architecture.md: added 6 consumer API endpoints (GET/PUT /consumer,
discover, verify-signature, import, import/status) to REST API section.
airgap-operations-runbook.md: cross-reference to UI import alternative.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>