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docs/modules/airgap/README.md

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+# AirGap
+
+**Status:** Implemented
+**Source:** `src/AirGap/`
+**Owner:** Platform Team
+
+## Purpose
+
+AirGap manages sealed knowledge snapshot export and import for offline/air-gapped deployments. Provides time-anchored snapshots with staleness policies, deterministic bundle creation, and secure import validation for complete offline operation.
+
+## Components
+
+**Services:**
+- `StellaOps.AirGap.Controller` - Snapshot orchestration and staleness enforcement
+- `StellaOps.AirGap.Importer` - Import validation and bundle ingestion
+
+**Libraries:**
+- `StellaOps.AirGap.Policy` - Staleness policy evaluation
+- `StellaOps.AirGap.Time` - Time anchor validation and trust
+- `StellaOps.AirGap.Storage.Postgres` - PostgreSQL storage for snapshots
+- `StellaOps.AirGap.Storage.Postgres.Tests` - Storage integration tests
+
+## Configuration
+
+See `etc/airgap.yaml.sample` for configuration options.
+
+Key settings:
+- Staleness policy (maxAgeHours, warnAgeHours, staleAction)
+- Time anchor requirements (requireTimeAnchor)
+- Per-content staleness budgets (advisories, VEX, packages, mitigations)
+- PostgreSQL connection (schema: `airgap`)
+- Export/import paths and validation rules
+
+## Dependencies
+
+- PostgreSQL (schema: `airgap`)
+- Authority (authentication)
+- ExportCenter (bundle creation)
+- Mirror (snapshot sources)
+- All data modules (Concelier, VexHub, SbomService, etc.)
+
+## Related Documentation
+
+- Operations: `./operations/` (if exists)
+- Offline Kit: `../../24_OFFLINE_KIT.md`
+- Mirror: `../mirror/`
+- ExportCenter: `../export-center/`
+
+## Current Status
+
+Implemented with Controller for snapshot export and Importer for secure ingestion. Staleness policies enforce time-bound validity. Integrated with ExportCenter for bundle packaging and all data modules for content export/import.