Restructure solution layout by module

src/ExportCenter/StellaOps.ExportCenter.DevPortalOffline/AGENTS.md

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+# DevPortal Offline Export Guild Charter
+
+## Mission
+Package developer portal assets, OpenAPI specs, and SDK binaries into reproducible bundles for air-gapped environments.
+
+## Scope
+- Integrate with Export Center to produce `devportal --offline` bundles.
+- Manage checksum manifests, DSSE signatures, and provenance.
+- Provide validation tooling for operators importing bundles.
+
+## Definition of Done
+- Offline bundle builds reproducibly with signed manifests and verification scripts.
+- Export job documented and available via CLI/Console.
+- Operators can validate bundle integrity without external services.

src/ExportCenter/StellaOps.ExportCenter.DevPortalOffline/TASKS.md

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+# DevPortal Offline Export Task Board — Epic 17: SDKs & OpenAPI Docs
+
+## Sprint 64 – Bundle Implementation
+| ID | Status | Owner(s) | Depends on | Description | Exit Criteria |
+|----|--------|----------|------------|-------------|---------------|
+| DVOFF-64-001 | TODO | DevPortal Offline Guild, Exporter Guild | DEVPORT-64-001, SDKREL-64-002 | Implement Export Center job `devportal --offline` bundling portal HTML, specs, SDK artifacts, changelogs, and verification manifest. | Job executes in staging; manifest contains checksums + DSSE signatures; docs updated. |
+| DVOFF-64-002 | TODO | DevPortal Offline Guild, AirGap Controller Guild | DVOFF-64-001 | Provide verification CLI (`stella devportal verify bundle.tgz`) ensuring integrity before import. | CLI command validates signatures; integration test covers corrupted bundle; runbook updated. |