feat(gitlab): new GitLab project-security integration

GitLab API v4, 6 commands: list vulnerabilities, list/create issues, get
project, list audit events. Private-token auth, stdlib-only.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

integrations/gitlab/manifest.yaml

@@ -0,0 +1,79 @@
+id: gitlab
+name: GitLab
+version: 1.0.0
+description: "GitLab (API v4) — project security and issue tracking: list project vulnerabilities, list and create issues, read a project, and list audit events. Private-token authentication; stdlib-only, no extra Python dependencies."
+changelog: "1.0.0 — Initial release: list vulnerabilities, list/create issues, get project, list audit events."
+category: devsecops
+
+# Per-instance configuration. Auth header 'PRIVATE-TOKEN: <token>'.
+config_schema:
+  properties:
+    base_url:
+      type: string
+      description: "GitLab URL"
+      default: "https://gitlab.com"
+    token:
+      type: string
+      description: "Personal/project access token"
+      x-soar-sensitive: true
+  required:
+    - token
+
+commands:
+  - id: list_vulnerabilities
+    name: gitlab-list-vulnerabilities
+    description: "List a project's vulnerabilities."
+    risk: read
+    inputs_schema:
+      properties:
+        project_id: { type: string, description: "Project ID or URL-encoded path (namespace/project)" }
+      required: [project_id]
+    outputs_schema: { properties: {} }
+  - id: list_issues
+    name: gitlab-list-issues
+    description: "List a project's issues."
+    risk: read
+    inputs_schema:
+      properties:
+        project_id: { type: string, description: "Project ID or path" }
+        state: { type: string, description: "opened or closed (optional)" }
+      required: [project_id]
+    outputs_schema: { properties: {} }
+  - id: create_issue
+    name: gitlab-create-issue
+    description: "Create an issue in a project."
+    inputs_schema:
+      properties:
+        project_id: { type: string, description: "Project ID or path" }
+        title: { type: string, description: "Issue title" }
+        description: { type: string, description: "Issue description" }
+        labels: { type: string, description: "Comma-separated labels (optional)" }
+      required: [project_id, title]
+    outputs_schema: { properties: {} }
+  - id: get_project
+    name: gitlab-get-project
+    description: "Get a project's metadata."
+    risk: read
+    inputs_schema:
+      properties:
+        project_id: { type: string, description: "Project ID or path" }
+      required: [project_id]
+    outputs_schema: { properties: {} }
+  - id: list_audit_events
+    name: gitlab-list-audit-events
+    description: "List instance audit events."
+    risk: read
+    inputs_schema:
+      properties:
+        limit: { type: number, description: "Max events (default 50)" }
+      required: []
+    outputs_schema: { properties: {} }
+
+  - id: test_connection
+    name: gitlab-test-connection
+    description: "Verify the token (used by the Test button)."
+    risk: read
+    inputs_schema:
+      properties: {}
+      required: []
+    outputs_schema: { properties: {} }