ci: remove unavailable models from review matrix

Only gpt-5 is currently deployed on SAP AI Core. Remove models that
fail with 'no deployment found' errors:
- claude-sonnet-4-6
- gpt-4.1
- gpt-4.1-mini
- gpt-5-mini

This can be reverted once the models are deployed.

.gitea/workflows/ci.yml

@@ -19,7 +19,6 @@ jobs:
       - run: go build -o review-bot ./cmd/review-bot
 
   # Self-review: builds from source since we're pre-release
-  # Models configured to match SAP AI Core deployments
   review:
     runs-on: ubuntu-24.04
     if: github.event_name == 'pull_request'
@@ -27,11 +26,9 @@ jobs:
     strategy:
       matrix:
         include:
-          - name: sonnet
-            token_secret: SONNET_REVIEW_TOKEN
-            provider: anthropic
-            llm_path: /anthropic/v1
-            model: anthropic--claude-4.6-sonnet
+          # Only gpt-5 is deployed on SAP AI Core currently
+          # Other models (gpt-4.1, gpt-4.1-mini, gpt-5-mini, claude-sonnet-4-6)
+          # fail with "no deployment found" errors
           - name: gpt
             token_secret: GPT_REVIEW_TOKEN
             provider: openai