Add Ruby language analyzer and related functionality

- Introduced global usings for Ruby analyzer.
- Implemented RubyLockData, RubyLockEntry, and RubyLockParser for handling Gemfile.lock files.
- Created RubyPackage and RubyPackageCollector to manage Ruby packages and vendor cache.
- Developed RubyAnalyzerPlugin and RubyLanguageAnalyzer for analyzing Ruby projects.
- Added tests for Ruby language analyzer with sample Gemfile.lock and expected output.
- Included necessary project files and references for the Ruby analyzer.
- Added third-party licenses for tree-sitter dependencies.

docs/modules/issuer-directory/operations/offline-kit.md

@@ -0,0 +1,71 @@
+# Issuer Directory Offline Kit Notes
+
+## Purpose
+Operators bundling Stella Ops for fully disconnected environments must include the Issuer Directory service so VEX Lens, Excititor, and Policy Engine can resolve trusted issuers without reaching external registries.
+
+## 1 · Bundle contents
+Include the following artefacts in your Offline Update Kit staging tree:
+
+| Path (within kit) | Source | Notes |
+| --- | --- | --- |
+| `images/issuer-directory-web.tar` | `registry.stella-ops.org/stellaops/issuer-directory-web` (digest from `deploy/releases/<channel>.yaml`) | Export with `crane pull --format=tar` or `skopeo copy docker://... oci:...`. |
+| `config/issuer-directory/issuer-directory.yaml` | `etc/issuer-directory.yaml` (customised) | Replace Authority issuer, tenant header, and log level as required. |
+| `config/issuer-directory/csaf-publishers.json` | `src/IssuerDirectory/StellaOps.IssuerDirectory/data/csaf-publishers.json` or regional override | Operators can edit before import to add private publishers. |
+| `secrets/issuer-directory/connection.env` | Secure secret store export (`ISSUER_DIRECTORY_MONGO_CONNECTION_STRING=`) | Encrypt at rest; Offline Kit importer places it in the Compose/Helm secret. |
+| `docs/issuer-directory/deployment.md` | `docs/modules/issuer-directory/operations/deployment.md` | Ship alongside kit documentation for operators. |
+
+> **Image digests:** Update `deploy/releases/2025.10-edge.yaml` (or the relevant manifest) with the exact digest before building the kit so `offline-manifest.json` can assert integrity.
+
+## 2 · Compose (air-gapped) deployment
+1. Load images locally on the target:
+   ```bash
+   docker load < images/issuer-directory-web.tar
+   ```
+2. Copy Compose artefacts:
+   ```bash
+   cp deploy/compose/docker-compose.airgap.yaml .
+   cp deploy/compose/env/airgap.env.example airgap.env
+   cp secrets/issuer-directory/connection.env issuer-directory.mongo.env
+   ```
+3. Update `airgap.env` with site-specific values (Authority issuer, tenant, ports) and remove outbound endpoints.
+4. Bring up the service:
+   ```bash
+   docker compose \
+     --env-file airgap.env \
+     --env-file issuer-directory.mongo.env \
+     -f docker-compose.airgap.yaml up -d issuer-directory
+   ```
+5. Verify via `curl -k https://issuer-directory.airgap.local:8447/health/live`.
+
+## 3 · Kubernetes (air-gapped) deployment
+1. Pre-load the OCI image into your local registry mirror and update `values-airgap.yaml` to reference it.
+2. Apply the secret bundled in the kit:
+   ```bash
+   kubectl apply -f secrets/issuer-directory/connection-secret.yaml
+   ```
+   (Generate this file during packaging with `kubectl create secret generic issuer-directory-secrets ... --dry-run=client -o yaml`.)
+3. Install/upgrade the chart:
+   ```bash
+   helm upgrade --install stellaops deploy/helm/stellaops \
+     -f deploy/helm/stellaops/values-airgap.yaml \
+     --set services.issuer-directory.env.ISSUERDIRECTORY__AUTHORITY__ISSUER=https://authority.airgap.local/realms/stellaops
+   ```
+4. Confirm `issuer_directory_changes_total` is visible in your offline Prometheus stack.
+
+## 4 · Import workflow summary
+1. Run `ops/offline-kit/build_offline_kit.py` with the additional artefacts noted above.
+2. Sign the resulting tarball and manifest (Cosign) and record the SHA-256 in the release notes.
+3. At the destination:
+   ```bash
+   stellaops-cli offline kit import \
+     --bundle stella-ops-offline-kit-<version>-airgap.tar.gz \
+     --destination /opt/stellaops/offline-kit
+   ```
+4. Follow the Compose or Helm path depending on your topology.
+
+## 5 · Post-import validation
+- [ ] `docker images | grep issuer-directory` (Compose) or `kubectl get deploy stellaops-issuer-directory` (Helm) shows the expected version.
+- [ ] `csaf-publishers.json` in the container matches the offline bundle (hash check).
+- [ ] `/issuer-directory/issuers` returns global seed issuers (requires token with `issuer-directory:read` scope).
+- [ ] Audit collection receives entries when you create/update issuers offline.
+- [ ] Offline kit manifest (`offline-manifest.json`) lists `images/issuer-directory-web.tar` and `config/issuer-directory/issuer-directory.yaml` with SHA-256 values you recorded during packaging.