docs: add documentation to main repository

docs/integrations/ci-cd.mdx

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+---
+title: "CI/CD Integration"
+description: "Run Strix in any CI/CD pipeline"
+---
+
+Strix runs in headless mode for automated pipelines.
+
+## Headless Mode
+
+Use the `-n` or `--non-interactive` flag:
+
+```bash
+strix -n --target ./app --scan-mode quick
+```
+
+## Exit Codes
+
+| Code | Meaning |
+|------|---------|
+| 0 | No vulnerabilities found |
+| 1 | Execution error |
+| 2 | Vulnerabilities found |
+
+## GitLab CI
+
+```yaml .gitlab-ci.yml
+security-scan:
+  image: docker:latest
+  services:
+    - docker:dind
+  variables:
+    STRIX_LLM: $STRIX_LLM
+    LLM_API_KEY: $LLM_API_KEY
+  script:
+    - curl -sSL https://strix.ai/install | bash
+    - strix -n -t ./ --scan-mode quick
+```
+
+## Jenkins
+
+```groovy Jenkinsfile
+pipeline {
+    agent any
+    environment {
+        STRIX_LLM = credentials('strix-llm')
+        LLM_API_KEY = credentials('llm-api-key')
+    }
+    stages {
+        stage('Security Scan') {
+            steps {
+                sh 'curl -sSL https://strix.ai/install | bash'
+                sh 'strix -n -t ./ --scan-mode quick'
+            }
+        }
+    }
+}
+```
+
+## CircleCI
+
+```yaml .circleci/config.yml
+version: 2.1
+jobs:
+  security-scan:
+    docker:
+      - image: cimg/base:current
+    steps:
+      - checkout
+      - setup_remote_docker
+      - run:
+          name: Install Strix
+          command: curl -sSL https://strix.ai/install | bash
+      - run:
+          name: Run Scan
+          command: strix -n -t ./ --scan-mode quick
+```
+
+<Note>
+All CI platforms require Docker access. Ensure your runner has Docker available.
+</Note>