docs: Add CI/CD integration guide (GitHub Actions, Azure DevOps)

[spboyer]

Closes #89

Adds CI/CD integration guide to the GitHub Pages docs site.

Replaces #97 (closed — had leaked .squad/ files).

[Copilot]

Pull request overview

This PR replaces #97 (which had leaked .squad/ files) and adds a comprehensive CI/CD integration guide to the waza docs site at site/src/content/docs/guides/ci-cd.mdx. The guide covers installing waza in CI, running evaluations in GitHub Actions, Azure DevOps, and GitLab CI, along with best practices and troubleshooting tips.

Changes:

• Rewrites the existing ci-cd.mdx guide from a simple GitHub Actions-focused page into a comprehensive multi-platform CI/CD integration guide covering GitHub Actions, Azure DevOps, and GitLab CI
• Adds sections for token budget checks, caching, path filtering, advanced workflows (baseline comparison, multi-stage pipelines), and troubleshooting
• Adds tabbed UI components for cross-platform secret configuration examples

Comments suppressed due to low confidence (2)

site/src/content/docs/guides/ci-cd.mdx:267

• This uses waza tokens diff with non-existent --ref1 and --ref2 flags. The correct command is waza tokens compare, which takes positional arguments: waza tokens compare origin/main HEAD --format json > token-diff.json. Additionally, the jq '.exceeded' check is wrong — the JSON output has no top-level exceeded field. The correct check would be jq '.summary.exceededCount' (an integer, not a boolean), so the condition should be something like if [ "$EXCEEDED" -gt 0 ].

```yaml
- script: |
    waza tokens diff \
      --ref1 origin/main \
      --ref2 HEAD \
      --format json > token-diff.json
    
    EXCEEDED=$(jq '.exceeded' token-diff.json)
    if [ "$EXCEEDED" == "true" ]; then
      echo "##vso[task.logissue type=error;]Token budget exceeded"
      exit 1
    fi
  displayName: 'Check token budget'

**site/src/content/docs/guides/ci-cd.mdx:379**
* Same `waza tokens diff` issue here — the correct command is `waza tokens compare --strict`.

- name: Check token budget
  run: waza tokens diff --strict

</details>

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