Add new features and tests for AirGap and Time modules

- Introduced `SbomService` tasks documentation.
- Updated `StellaOps.sln` to include new projects: `StellaOps.AirGap.Time` and `StellaOps.AirGap.Importer`.
- Added unit tests for `BundleImportPlanner`, `DsseVerifier`, `ImportValidator`, and other components in the `StellaOps.AirGap.Importer.Tests` namespace.
- Implemented `InMemoryBundleRepositories` for testing bundle catalog and item repositories.
- Created `MerkleRootCalculator`, `RootRotationPolicy`, and `TufMetadataValidator` tests.
- Developed `StalenessCalculator` and `TimeAnchorLoader` tests in the `StellaOps.AirGap.Time.Tests` namespace.
- Added `fetch-sbomservice-deps.sh` script for offline dependency fetching.

docs/implplan/SPRINT_0142_0001_0001_sbomservice.md

@@ -19,9 +19,9 @@
 ## Delivery Tracker
 | # | Task ID | Status | Key dependency / next step | Owners | Task Definition |
 | --- | --- | --- | --- | --- | --- |
-| P1 | PREP-SBOM-CONSOLE-23-001-BUILD-TEST-FAILING-D | TODO | Due 2025-11-22 · Accountable: SBOM Service Guild; Cartographer Guild | SBOM Service Guild; Cartographer Guild | Build/test failing due to missing NuGet feed; need feed/offline cache before wiring storage and validating `/console/sboms`. <br><br> Document artefact/deliverable for SBOM-CONSOLE-23-001 and publish location so downstream tasks can proceed. |
-| P2 | PREP-SBOM-SERVICE-21-001-WAITING-ON-LNM-V1-FI | TODO | Due 2025-11-22 · Accountable: SBOM Service Guild; Cartographer Guild | SBOM Service Guild; Cartographer Guild | Waiting on LNM v1 fixtures (due 2025-11-18 UTC) to freeze schema; then publish normalized SBOM projection read API with pagination + tenant enforcement. <br><br> Document artefact/deliverable for SBOM-SERVICE-21-001 and publish location so downstream tasks can proceed. |
-| P3 | PREP-BUILD-INFRA-SBOM-SERVICE-GUILD-BLOCKED-M | TODO | Due 2025-11-22 · Accountable: Planning | Planning | BLOCKED (multiple restore attempts still hang/fail; need vetted feed/cache). <br><br> Document artefact/deliverable for Build/Infra · SBOM Service Guild and publish location so downstream tasks can proceed. |
+| P1 | PREP-SBOM-CONSOLE-23-001-BUILD-TEST-FAILING-D | DONE (2025-11-20) | Due 2025-11-22 · Accountable: SBOM Service Guild; Cartographer Guild | SBOM Service Guild; Cartographer Guild | Build/test failing due to missing NuGet feed; need feed/offline cache before wiring storage and validating `/console/sboms`. <br><br> Deliverable: offline feed plan + cache in `local-nugets/`; doc at `docs/modules/sbomservice/offline-feed-plan.md`; script `tools/offline/fetch-sbomservice-deps.sh` hydrates required packages. |
+| P2 | PREP-SBOM-SERVICE-21-001-WAITING-ON-LNM-V1-FI | DOING (2025-11-20) | Due 2025-11-22 · Accountable: SBOM Service Guild; Cartographer Guild | SBOM Service Guild; Cartographer Guild | Waiting on LNM v1 fixtures (due 2025-11-18 UTC) to freeze schema; then publish normalized SBOM projection read API with pagination + tenant enforcement. <br><br> Document artefact/deliverable for SBOM-SERVICE-21-001 and publish location so downstream tasks can proceed. Prep artefact: `docs/modules/sbomservice/prep/2025-11-20-sbom-service-21-001-prep.md`. |
+| P3 | PREP-BUILD-INFRA-SBOM-SERVICE-GUILD-BLOCKED-M | DOING (2025-11-20) | Due 2025-11-22 · Accountable: Planning | Planning | BLOCKED (multiple restore attempts still hang/fail; need vetted feed/cache). <br><br> Document artefact/deliverable for Build/Infra · SBOM Service Guild and publish location so downstream tasks can proceed. Prep artefact: `docs/modules/sbomservice/prep/2025-11-20-build-infra-prep.md`. |
 | 1 | SBOM-AIAI-31-001 | DONE | Implemented `/sbom/paths` with env/blast-radius/runtime flags + cursor paging and `/sbom/versions` timeline; in-memory deterministic seed until storage wired. | SBOM Service Guild (src/SbomService/StellaOps.SbomService) | Provide path and version timeline endpoints optimised for Advisory AI. |
 | 2 | SBOM-AIAI-31-002 | DONE | Metrics + cache-hit tagging implemented; Grafana starter dashboard added; build/test completed locally. | SBOM Service Guild; Observability Guild | Instrument metrics for path/timeline queries and surface dashboards. |
 | 3 | SBOM-CONSOLE-23-001 | BLOCKED | PREP-SBOM-CONSOLE-23-001-BUILD-TEST-FAILING-D | SBOM Service Guild; Cartographer Guild | Provide Console-focused SBOM catalog API. |
@@ -49,6 +49,9 @@
 ## Execution Log
 | Date (UTC) | Update | Owner |
 | --- | --- | --- |
+| 2025-11-20 | Published SBOM service prep docs (sbom-service-21-001, build/infra) and set P2/P3 to DOING after confirming unowned. | Project Mgmt |
+| 2025-11-20 | Completed PREP-SBOM-CONSOLE-23-001: offline feed cache populated (`local-nugets/`), script added (`tools/offline/fetch-sbomservice-deps.sh`), doc published at `docs/modules/sbomservice/offline-feed-plan.md`. | Project Mgmt |
+| 2025-11-20 | Marked PREP-SBOM-CONSOLE-23-001 DOING after confirming it was still unclaimed. | Project Mgmt |
 | 2025-11-19 | Assigned PREP owners/dates; see Delivery Tracker. | Planning |
 | 2025-11-17 | Normalised sprint to standard template and renamed from `SPRINT_142_sbomservice.md`; no scope changes. | Project Mgmt |
 | 2025-11-17 | Flagged need for SBOM Service module dossier as documentation prerequisite. | Project Mgmt |