ci: switch CTO reviewer from Anthropic direct to OpenRouter

Reuses the OPENROUTER_API_KEY secret that already backs the other AI
plugins. Consolidates AI spend on one bill. Model: anthropic/claude-haiku-4.5.

.github/workflows/cto-review.yml

@@ -224,22 +224,25 @@ jobs:
           PY
 
       - name: Post PR review
-        # Always posts as COMMENT — not APPROVE/REQUEST_CHANGES — because the default
-        # GITHUB_TOKEN is not permitted to formally approve PRs without toggling a
-        # repo setting. The verdict is still prominent in the first line of the body
-        # ("## CTO Review — APPROVE|REQUEST_CHANGES|COMMENT"). Human merges, so the
-        # GitHub-native review state isn't load-bearing.
         if: steps.claude.outputs.skipped != '1'
         uses: actions/github-script@v7
+        env:
+          VERDICT: ${{ steps.claude.outputs.verdict }}
         with:
           script: |
             const fs = require('fs');
             const body = fs.readFileSync('/tmp/review-body.md', 'utf8');
+            const verdict = process.env.VERDICT;
+            const eventMap = {
+              'APPROVE': 'APPROVE',
+              'REQUEST_CHANGES': 'REQUEST_CHANGES',
+              'COMMENT': 'COMMENT'
+            };
             await github.rest.pulls.createReview({
               owner: context.repo.owner,
               repo: context.repo.repo,
               pull_number: context.issue.number,
-              event: 'COMMENT',
+              event: eventMap[verdict] || 'COMMENT',
               body,
             });